Does it smell bad, like as if you have a 6 month old sippy cup full of milk under the seat?
Or do you just wish it had a nice smell?
Most cleaners and conditioners have a perfume/musk of some sort, so the PO probably just used something you liked. I hear the Zaino stuff smells good, although I've never used it. There used to be a store in Denver called Detailers Paradise (near Broadway and Evans), but I think they closed their doors and only do internet sales now. Unfortunately, you might just have to trying smelling the stuff at Checker, or see what the internets recommend.
I spilled 90 weight in the back of mine, and I can't kill that smell....