My true blue stang has water spots on the hood roof and trunk that will not come off, I had clay barred it a year ago and I guess that din't do it. I tried 3M's paint cleaner and seemed to help some I just tried it last week but I plan on waxing and polishing soon and don't want to seal that stuff back in any suggestions? I heard someone say to use white vinegar because of its ph it will help with hard water deposits. Thanks