Larry
I have tried several things including 303 and nothing seems to get the job done. I live in Texas so bugs on the front can are plentiful. I did not notice a significant difference with 303, wax, or AQUANIL-X, CroftgateUSA's waterless car wash. One other problem, mainly in the fronts, has been black streaks. My latest experiment is RejeX, a ultra thin polymer coating. It applies like 303 but was easier to wipe off without swirls. I also scrubber 1/2 the roof and applied 303. It's been about a month and so far much better. A lot less gunk from the roof. Time will tell
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