I had a pretty well "marked" up one when I purchased my red bike. I took a razor blade to shave the excess plastic off out of the scrapes, wiped it with 150 grit paper, then just a little light rubbing with 220 grit. I then cleaned both mirrors down with Windex then alcohol because the plastic was getting pretty old looking on both. I then painted them both with Krylon Fusion for plastics using the satin black color. They look almost brand new more than 4 years later. Just cost $4 to do.