Plastic does act like a green house. Your thought about the car cover and then the plastic when it rains seems good. They do make some car covers that vent a lil better yet are pretty water tight. Seen em at some auto place once.
One thing that did work for me is I got a car cover made out of a tent type material and sprayed it down with water proofer spray. Worked pretty good. When it rained alot had to reapply.
Hope it helps!
Monday, March 26th, 2007 AT 1:42 PM