the GM is easy to care for. It hides small imperfections well, and dirt for that matter.
Black will keep you busy.
I like white because it really pops when you add black wheels and black accents, or white wheels. It takes longer to get dirty than the others, but white never seems to pay off after waxing and detailing. It never seems to have that DEEP look that the other colors have.
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wax
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