OK, let's clarify a few things. He has waterspots. There are two kinds of waterspots. You have the kind that are caused from acid rain. The rain is slightly acidic. It lands on the car. And dries on the car. The acidic mixture then etches into the paint as it dries, leaving an outline around the bead of water. The heat fromthe sun accelerates the process. This is the worst kind and requires real "buffing" to fix.
The other kind is spots from hard water. This would be mineral deposits left from washing the car. Similar to acid water spots except no etching occurs. Deposits are Left when the water evaporates, leaving the dissolved minerals as a precipitate on the surface of the car. They are the easier spots to fix.
The trick is to figure out which kind you have.
As a rule, if you can wash the offending spot and it seems to help, you have deposits. If you wash and it doesn't get any better then you have acid.
So, to the original poster, which do you have? Each has a different approach to fix.
The other kind is spots from hard water. This would be mineral deposits left from washing the car. Similar to acid water spots except no etching occurs. Deposits are Left when the water evaporates, leaving the dissolved minerals as a precipitate on the surface of the car. They are the easier spots to fix.
The trick is to figure out which kind you have.
As a rule, if you can wash the offending spot and it seems to help, you have deposits. If you wash and it doesn't get any better then you have acid.
So, to the original poster, which do you have? Each has a different approach to fix.
