I have a problem... No matter how many times I was my car, the ABS plastic bumpers NEVER come clean. There are always dirt spots and bugs stuck on. Is there anything that you could suggest to help clean and maintain the bumpers? The paint is Electrin Currant Red, if that helps any. Oh, and are there any tips anyone could offer to get the best looking touchups using those little nailpolish-like tubes of paint? Thanks for any input.