Hey guys, thanks for all the replies. I haven't checked the thread because I thought I would get an e-mail when there was a reply. Looks like I have a few things I can try out this week. I picked up a clay bar, but haven't had time to try it out. But now that there are a few other liquid ideas that I have in the house, I'm going to see if any of them work first. Hard water stains does seem logical. I'll give vinegar and nail polish remover a test tonight before running out. 
