I showed my son how steel wool could clean things so one day while I was gone he started polishing the front bumper on my Barracuda to impress me. When he started seeing copper he stopped. He never said anything about it until I noticed the copper after which he confessed to trying to impress me with his skills. I couldn't get mad at him since he was trying to help and I had planned to get new bumpers anyway. He's a good kid!!!