Founder Diaries · The Full Story · Origin · ISIPCA · Pune Testing
Where It Started - My Mother, Every Road Trip, and a Paper Bag in the Glovebox
My mother has had motion sickness her entire life. Not the mild, look-out-the-window variety. The kind where she boards a bus and you can already see her preparing - settling in, closing her eyes, doing whatever internal negotiation she has learned to do with her own nervous system. Long drives were never something she looked forward to. They were something she endured.
As a family we accommodated this the way families do - windows cracked, no screens in the car, front seat wherever possible, paper bag in the glovebox as a matter of routine. We stopped at the right places on highway drives. We knew the signs. We learned to read the quality of her silence.
What none of us thought to question, for years, was the car freshener. It was just there. It was what cars had. The little vanilla block from the petrol pump, the synthetic floral from the accessories shop near our building, the tree-shaped cardboard thing a relative had brought from abroad. None of us looked at it as a variable. It was furniture.
"The car freshener was just there. It was what cars had. It did not occur to any of us, for years, that it was not neutral."
The first time I noticed the connection was not dramatic. It was on a drive from Pune to a hill station - I don't need to name it, every Pune family has the same drive - when we switched cars at the last minute to a relative's vehicle that happened to have no freshener. My mother, who normally needed the paper bag before we cleared the city limits, was fine for the full three hours. She commented on it. We noted it. And then we got back in our car with its synthetic vanilla block, drove home, and she was not fine.
I want to be honest: I did not immediately think "I will now make a car freshener." I thought: something in that car was different. And I started pulling on the thread.
The Moment I Asked the Right Question
I had been interested in fragrance for years - it was already part of my life in ways that would eventually lead to SOSA. So when I started researching the connection between car fresheners and nausea, I was not starting from zero. I knew a little about how fragrance compounds work. What I did not know was how they behave specifically in an enclosed, heated, recirculated environment - which is exactly what a car is.
The research took me to a few places. One of them was unglamorous: I spent a long time sitting in my own car, parked in direct sun in April, with different freshener types, taking notes on what happened. Not scientific, not systematic, just observational. What I noticed was that every freshener I could buy in India - petrol pump blocks, mall accessories stalls, online imports - smelled completely different in a hot parked car than it did in the shop. Not stronger in a nice way. Denser. Heavier. Like the fragrance had been compressed and then released all at once.
I learned the reason later, with proper training. But the observation came first: these products are not behaving the way they were designed to behave in an Indian car in April. The design condition and the use condition are completely different environments.
I also spent time reading. Not just fragrance research - medical research. The connection between synthetic fragrance compounds and trigeminal nerve irritation. The relationship between heavy base note compounds and the chemoreceptor trigger zone that initiates nausea. The specific role of phthalate-based carriers, which most synthetic fragrances use, in causing the "headache behind the eyes" pattern that so many people associate with car travel without realising the freshener is the cause.
The more I read, the clearer the question became. It was not: "what scent doesn't make people sick?" It was: "what kind of formula, in what kind of format, behaves correctly in an Indian car at Indian temperatures for Indian passengers - including the most sensitive ones?" That was the question. And I could not find an existing product that had been built around it.
Why I Went to Versailles - What ISIPCA Taught Me That Changed Everything
I had been self-educating - reading, experimenting, making notes - but I reached the limit of what I could figure out without formal training fairly quickly. Fragrance chemistry is a real discipline. The way compounds interact, the way they behave across temperature ranges, the way a formula's character changes from lab condition to use condition - these things require a framework that I did not have.
So I went to ISIPCA. Institut Supérieur International du Parfum, de la Cosmétique et de l'Aromatique alimentaire, in Versailles. It is one of the most respected fragrance training institutions in the world - many of the perfumers behind fragrances you know and love have trained there. Going was not the most practical decision I have ever made. It was expensive, it required a significant period away, and I was doing it specifically to solve a problem that most people in the fragrance industry would consider very unsexy: a car freshener for motion-sick Indians.
But ISIPCA gave me three things that I could not have gotten any other way.
1. How fragrance behaves at temperature. The Clausius-Clapeyron relationship between temperature and vapour pressure is not a formula you can intuit. Learning it formally - and then applying it to the specific temperature conditions of an Indian parked car - made the entire problem make sense at a molecular level. A freshener calibrated for 22°C in a European lab is not the same product at 55°C in a Pune summer. The release rate changes exponentially. The formula I needed had to be evaluated at the right temperature from the start.
2. Intended population as a formulation principle. There is a module at ISIPCA that covers evaluating a formula not just for average response but for the most sensitive person likely to encounter it. For a perfume on a wrist, that might be someone with reactive skin. For a car freshener in India, that is a motion-sick child in the backseat in May. I had been thinking about this instinctively. ISIPCA gave me the framework to make it a design principle.
3. What phthalates actually do. I knew from my research that phthalates were associated with headaches. ISIPCA taught me exactly why - the trigeminal nerve pathway, the specific compounds responsible, the concentration threshold at which they become irritants in a small enclosed heated space. The knowledge moved me from "probably remove phthalates" to "remove phthalates, full stop, non-negotiable." There is no mild version of a phthalate-laden formula that is safe for a sensitive passenger in an Indian car in summer.I came back from Versailles with a notebook full of things I now knew I had been doing wrong, a clearer idea of what the formula actually needed to be, and a genuine excitement about going back into the car with better tools. The unsexy car freshener problem suddenly had a very clear architecture to it. Now I just had to solve it.
"I came back from Versailles knowing exactly what I had been doing wrong. Which meant I also knew, for the first time, what doing it right would actually require."
Coming Back and Getting It Wrong - The First Two Years
I want to spend some time here because I think the narrative of "trained at a prestigious institution, came back, made a great product" leaves out the most useful part of the story. I came back from ISIPCA with better knowledge. I still spent the better part of two years getting it wrong.
The failures were not random. Each one taught me something specific. But they were failures, and they cost time and money and at one point genuine doubt about whether this was actually solvable in the way I hoped.
Two years. Five significant dead ends. Each one taught me something I could not have learned from the formulation module alone. The heat test data I now publish on the blog - all of it came from this period. All of it came from things that did not work before one thing finally did.
Pune Summer. A Hatchback. Three People. No Air Conditioning at First.
The formal test protocol came together after the second year - once I had a formula and format I believed in and needed to verify properly. The approach was deliberate: same car (a compact hatchback, the kind most Indian families actually drive), same location (Pune, which gives you genuinely extreme summer temperatures without the humidity variable of coastal cities), same time of year (April and May, when parked cars reach 55-60°C in direct sun), and a consistent tester panel.
Three testers. Tester A: a regular driver, no particular fragrance sensitivity, someone who could tell me how the fragrance actually smelled and how it developed over the course of a drive. Tester B: a passenger with motion sickness - not occasional queasiness, actual motion sickness, the kind that has been a feature of their life since childhood. Tester C: a person with a specific fragrance-triggered headache history - the pressure-behind-the-eyes pattern that I now know is trigeminal nerve irritation from phthalate carriers.
The test structure was simple. Car parked in direct sun for a minimum of three hours before each session. All three testers assess the car on door opening. Drive for thirty minutes on a consistent route. Three assessment points: door opening, five minutes in, thirty minutes in. Every session, every prototype, every tester, consistent notes.
The first few sessions with Tester B were difficult to watch. Not dramatically - she was not getting severely ill. But I knew what she was managing. I could see the small internal adjustments. The eyes closing for a few minutes. The deliberate breathing. The polite "I'm fine" that I knew, by now, was her being a good sport rather than a comfortable passenger. She was a good sport through a lot of bad prototypes. I owe her a significant debt.
Tester C was quieter about it. He would complete drives and then, about two hours after, mention a headache. We cross-referenced the notes every time. Synthetic carrier in the formula - headache. Naturally-derived lemon base - no headache. The consistency of that correlation, session after session, was one of the clearest signals in the entire test programme.
The Test Session That Ended the Search
I will be specific because specificity is what makes this real rather than marketing narrative. It was a May morning. The car had been parked outside from 8am and we started the test session at 1pm. Interior temperature before opening: I measured it 39°C. This was not an unusual day. This was a normal Pune May afternoon.
The prototype in the car was the sixth iteration of the naturally-derived lemon formula in the oil-based hanging format - not the first, not the final product as it exists now, but close. I had adjusted the diffusion rate twice based on the previous sessions and settled on a rate I believed was right for the cabin size.
Tester C's note for that session: no headache. Not "mild headache." No headache. At the two-hour mark. At the four-hour mark. The next day. Nothing.
Tester A's note: "Smells like the car has been aired out. Clean. Like someone cut a lemon nearby and then left."
That was the session. We ran it again the following week with minor formula refinements. Same results. We ran it a third time. Same results. The search was over.
Making It Real - From Formula to Product
Getting from a working formula to an actual product people could buy was its own chapter of problems - sourcing, quantities, packaging, shelf life at Indian temperatures, testing across batches to ensure consistency. I will not dwell on every detail here because the production story is less interesting than the formulation story. But a few things are worth saying.
The first decision was that SOSA would make exactly one car freshener. Not a range. Not multiple scents. One. The lemon formula, because it was the one that worked - not just worked as a nice smell, but worked for the people it needed to work for: the motion-sick passenger, the headache-prone passenger, the child in the backseat, the elderly relative who politely rides with the window open in May and says she is fine.
I was advised more than once that a single SKU was a commercial risk. Customers like variety. Ranges feel more established. I understood the argument and disagreed with it. I had spent two years finding the formula that actually solved the problem. Releasing six versions of that formula in different scents would mean five of them were cosmetic variations of something that, for sensitive passengers in Indian summer heat, would not perform the way the lemon does. I was not willing to do that.
The 12ml size came from testing. Small enough to stay fresh across a reasonable use period in Indian heat, without so much liquid that it front-loads diffusion and creates the concentration spike that defeats the purpose. The hanging format - away from the vent, ambient rather than directed - was locked in from the test protocol failures. The phthalate-free formulation was non-negotiable from the moment I understood what phthalates were doing to Tester C's head.
The name was easy. Lemon. Not "Citrus Breeze." Not "Fresh Drive." Not any of the marketing language that takes a useful thing and makes it sound like a lifestyle accessory. Lemon. That is what is in it. That is what it does.
What Came After - The Feedback That Made It Worth It
I want to share some of the feedback we have received, because this is the part the Reddit commenter was asking about - what happened after the birth announcement. The places it went and the people it helped.
None of these are dramatic stories. Nobody's life changed. But the Lonavala feedback - the child who fell asleep on the drive back - stayed with me for a long time. Because I know exactly which test session that maps onto. I know what it cost to get to the formula that makes that possible. And I know that the person writing to me probably does not know why it worked. They just know it did.
My mother now knows, because I told her. She has used the freshener in her car for several months. She still takes the front seat when possible. But the paper bag has not been in the glovebox since we put the lemon diffuser in.
"The paper bag has not been in the glovebox since we put the lemon diffuser in. That sentence is what two years of work was for."
What This Product Is Not
I want to be precise about what the SOSA Lemon Car Freshener is and is not, because founder stories have a tendency to overclaim.
It is not a motion sickness cure. It is a fragrance that does not make motion sickness worse - which is what most car fresheners do, because most car fresheners were never designed with motion-sick passengers in mind. If your child has severe vestibular motion sickness on winding roads, the freshener will help but it is not the complete answer. It removes a trigger. It does not address the underlying sensitivity.
It is not a medical product. The research behind why lemon terpenes are easier on a nauseous nervous system is real - there are peer-reviewed studies on limonene and nausea that I did not manufacture. But we are a fragrance company, not a pharmaceutical one, and I am not making health claims.
It is not for everyone. If you love a strong oud in your car and your passengers are comfortable, this is not the product for you and I have no interest in persuading you otherwise. The SOSA Lemon Freshener was designed for a specific problem: the car where someone is always a little less fine than they should be, and where the freshener is part of why.
It is one thing done correctly. One scent, one format, one size, one purpose. Tested in the right conditions, for the right passengers, in the right country. That is the whole product.