Some of those black marks are very hard to remove. I've never tried the Black Streak Remover but have used a cleaner called "Awesome" that I purchased from the local dollar store. I've found that it's very good at getting off those black marks. It works really well on whitewalls, too.
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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