I purchased the Atmos Klear scentless deodorizer, which by the way is incredible. When was detailing a freinds BMW 850, yes, the kind of "excuse me, I seem to have moisened my undergarmets" kind of car. While he tried to keep it in top noth shape by having it detailed constantly, (unfortunately by a crapy detailer, who aperantely was on his cell phone while using a rotary!), the AC inevitably developed a moldy musty smell. You are suposed to turn the recurculate button on, and spray the Atmosklear de-odorizer into the air intake while running the AC for a few minutes. I was a little unsure about where this usually is. Is it DIRECTLY under the window where the wipers are, on the top of the hood near the windsheald where there are a bunch of openings, or on the front of the car? Thanks alot. -Brad Hayward