Thanks for the info, guys. I'm confused because I personally don't know anyone who has had this ongoing problem I'm having, yet Lexus says it is now a "maintenance item," so I guess there are some out there. I, too, thought about using the fresh air feature when this first started happening. Unfortunately, if you can believe this, the odor was worse! I'm not even kidding, it is the most vile smell you would ever imagine. No one wanted to get in the car with me because everyone was getting sick. Like I said, cleaning out this evaporator box (or whatever it's called) seemed to have an impact for a while. Ugh. I love my car. Wish there weren't so many darn problems!!!
Lola