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I used to use WD40 on lexan RC bodies to remove things like that. If it's safe you'd only need 1 can of WD-40 and a soft tee shirt.
May want to wait for a second opinion though..
I would try Lemon Pledge, the furniture spray wax first. Use a soft T-shirt material. WD-40 is a solvent and should only be used sparingly and with a fingertip covered with the soft T-shirt directly on the black mark only. If the general application of Lemon Pledge doesn't remove the mark, then apply a dab of WD-40 to your T-shirt coverd fingertip and work the black mark only. I bet that Lemon Pledge will get it, but use both if necessary. Lemon Pledge is best and cheapest cleaner/polisher for any type of windshield that you can buy. Always use that clean, dry, soft T-shirt type polishing rag.
You didn't say what caused the black mark? ................... BC
like biggol, i recommend wd-40. that stuff is incredible and can be used in a variety of circumstances. this should work well, but as a sidebar, it also works great in taking that sticky adhesive residue from price stickers off your products.
be cautious though and try a small inconspicious area first to see if there is an adversereaction
I'll second the WD-40 and suggest Novus #2 Fine Scratch remover/polish and finish with the Novus Plastic Cleaner. Both products work well on permanent ink that I use to mark lumber.
DO NOT use paper towels of any kind, on plastic.
Glad you got it off. I have a stick of red jewelers' rouge that I have had for years. A little of that on a soft cloth with a gentle circular rubbing motion will take off scratches too.
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