A few months ago some acetone got on my drivers side wing mirror panel, it damaged the plastic and left big ugly white marks down the panel, which wouldn't come off with cleaning, white spirit or any other normal means of stain removal, seen as it's sunny I thought I'd give it a blast of repair

About 8 quid worth of 1500 grit wet and dry and black plastic one coat and the panel looks brand new! (Also repaired a minor scratch on the edge whilst the surround was taped up)