I am using these here. I bought them about 10 years ago, and just love them. Heavily padded, magnets at the top to keep them in place (along with covered hooks which work well on the Corvette's). I just make a focused effort to clean the fender before I lay them down. Some of the best money I have spent!
http://netcore.byethost33.com/MuscleClassicSoltns.html
BTW, the "clingy" covers are known on occasion to raise hell with lacquer. Rarely, will you see those around an NCRS meet. They have even damaged paint in a short of time to judge a car FWIW.