Scotch-Brite(R) pads and similar from other companies are color coded for "grit". In industrial floor polishers, they are typically white, red, or blue. In the 3M line of workshop pads, there are 8 colors. What they call maroon (not the same bright red you find in auto supplies or janitorial) is about a 400 grit. It will take paint
overspray off fiberglass
or metal without damage. The dark gray pads are about 800 grit, they'll barely wear the same overspray. From a recent email
with 3M on this topic: Brown - 180 grit (Pad #7440) Maroon - 320-400 grit (Pad #7447) Green - 400 grit (Heavy Duty, Pad # 96) Gray - 600-1000 grit (Pad #7448) Blue - 1000 grit (Multipurpose/No Scratch) White - 1000 grit and finer (Pad #7445) Pink - 1000 grit and finer (Delicate Duty) Gold - 1200 and finer (Pad #7745) On the consumer market (supermarkets) we get yellow sponges with green pads, meant for bathroom cleaning
, and blue sponges with blue pads--which are safe for use on Teflon and other non-stick kitchen pans. A plastic single-edged razor blade (yes, there are such things) used to scrape ALONG the grain, not across it, might also take the crud off. They are designed for people like auto body detailers, so you can scrape labels and gummy deposits off painted surfaces, without the risk of scratching the way a metal blade would. No one seems very specific about what those are made of, aside from some saying "polycarbonate" sometimes. FWIW.