Water Spots! HELP!!
Nope and Nope again...

Like stated the sprinkler misted my car. The water formed into beads, evaporated and left mineral deposits.
I did hours of washing/claying/treating/buffing + an hour of Acid treatment in the shade... NOTHING..
When I run my finger nail over the spots there is no difference in texture between paint and spots..
My guess is this is some sort of sulfer/iron deposit baked into the paint..
Are there any professional detailers with experience on this in the house?
If that does not work go get some cleaner wax. If not that then try some rubbing compound.
I had some stubborn spots on my paint from the corrosive **** in the megquiar's chrome wheel cleaner. My car was wet and I had just got done washing it. Well I started spraying my wheel cleaner on my wheels and the wind was not blowing. I hosed them off. Then I went to dry off the car. Well after the 2nd time of this cycle I figured out that the wheel cleaner was getting in the water beads on my paint and made these horrible super stobborn water spots on my paint. Clay bar didn't even phase it. I think a really good washing, rinsing, and drying is what did the trick. Maybe you'll get lucky. Try cleaner wax... It gets hard-to-get kinda stuff out too. If not that buff with a rubbing compound. Let me know how it turns out.
(I'm assuming this isn't the standard GM paint problem with the clear coat actually opening up exposing the paint.)
btw it sounds bad but doesn't actually hurt your car at all. you are removing a very thin layer of clear coat and would literally have to spend hours in one spot to go completely through the clear coat. use a porter cable, not a rotary though, as the porter cable applies even pressure no matter how unevenly you press down on it. a rotary can easily eat through the clear coat if you don't know what you're doing.
in the future if you have to park next to sprinklers, either park far enough back in the spot to avoid their spray, or park so close to them that the sprinkler opens up under your fender so it doesn't spray on the paint.
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