If those water spots are from the sprinkler recycle "waste" water then you are going to need some stuff they sell at Home Depot. It is used to remove rust water spots created by that recycle water.
I had that problem when I bought my used 350Z in Florida. They use the recycle "nasty wate" water for the sprinklers at night and it bakes into the glass. I could never remove then entirely even with that remover from Home Depot. Sorry I cannot remember the name, but is kind of acid but it works comes in an orange container.
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2009 370Z MB Base w/Sport Package 6MT
Modshack's Custom Air Intakes /3M Clear Bra/ Illuminated Kick Plates / F. I CBE w/12" resonators / EVO-R Front Lip / Rear Hatch Wing / Tein S-Tech Springs /Ilegal Tint in the Rep. of VA/4x20mm Z1 Spacers/ Vinyl Roof/ Liquid Carbon Designs
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