So the scenario: Installed a new car stereo into the Honda Civic, had to cut a hole in the dash console area (next to the power socket) for the USB input. glued it in and overnight the polyurethane glue "oozed" out onto the car exterior. Promised to clean it. I thought hey, I've used rubbing alcohol a ton of times to clean anything and everything, so it should be safe. Turns out 100% alcohol will EAT the plastic of a '04 Honda Civic dash. The whole area turned to a ghastly grey and the cotton ball was black. I panicked. Thirty minutes later I came to the solution. I tried to google an answer and nothing came up, but this little juicy nugget helped me save the interior. Shoe Polish. Sure enough, applying the polish and buffing it returned the small area back to a glossy black. It's not 100% back to normal (I'd say in the low 90s) but it's better than before. I'm sure I can do some more polishing to get it back to it's previous condition, but whew at least I had the shoe polish!! And now we have a tasty little USB port for our head unit.