I'll tell you what a whole lot of us motorcyclist use. Spray on peroxide quite heavy, let it set for a couple minutes then wipe off with a wet towel. You'll see each one of them fizz for awhile before wiping off. I've been using it for years and never heard of it hurting expensive paint jobs or plastic windshields.
Of course the sooner you get them off the better. Never let them bake on for several days or you'll have a hard time.
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Les
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