I just washed my M3 by hand and found that all the little black specks that were sticking to the car left a tiny brown spec mark underneath when I removed them. It also sometimes streaked when I popped it off. The streaks I could rub off with some effort but most of the brown spots don't come up, but some did with a dry microfiber towel. I probably shouldn't have left them on as long as I did but there are no touchless car washes here in Brooklyn that I've been able to find and I've had a shoulder injury for the last 6 months (still have it actually but it isn't as sore).
Is there some product to use to remove the rest that I should try? I want to remove them before I apply a protective coat.
Is there some product to use to remove the rest that I should try? I want to remove them before I apply a protective coat.