Ask anyone with a 1999-2004 Jetta (or Golf, I don’t think it matters) if they smell melted crayons when they get into their cars, and their eyes will widen in exasperated recognition. They’ll know exactly what you’re talking about, especially if their car is a little older in that range.
The reason is the foam that’s used inside the center console and under the carpeting. It’s made of a particular type of stuff that will, over time, break down and out-gas in a certain way that smells like crayons. It’s caused people to sell their cars, and it’s probably driven more than a few people crazy.
My Trader Joe’s peanut butter chewy coated & drizzled granola bar smells like that smell.
Just so you know.