I have a Sunbird Convertible that unfortunately has to live outside because the Chevelles are inside. It is red with a white top. Even though I cover it the cover is cheap so it at least keeps rain from hitting the car at full force.

I have found bugs and stuff under the cover and the regular bugs and road dirt it gets have caused it to look dirty. I picked up some stuff called Charlie's Soap made in Mayoden, NC that does wonders.

http://www.charliesoap.com/

I sprayed it on and scrubbed with a brush and the dirt just rolled off and the top is white again!!! It is the best stuff I have found so far. Once it dries I am going to follow it up with some conditioner.