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Originally Posted by jsbarks  I had this happen the other day, I used a rag soaked in rainX wiper fluid and a little elbow grease. Cleared them up for me! |
If you're using rain-x on your windows already, it's probably just water spots on top of the polymers so it was the rag that really removed them. The rain-x wiper fluid won't remove spots on its own whatsoever.
Any unprotected glass will fill up with contaminants, and spot up in no time. Without some type of protectant in the seemingly porous crevices of the glass, it is like a sponge.
I agree, bar keepers friend will work. Personally, I use a specific glass polish on my clients vehicles. I cannot bring the name of the specific abrasives to bear at this particular moment. On my own, a good strong coat of rain-x on the glass 24/7 is extremely effective at preventing embedded contaminants and water spots if cleaned and treated regularly. From my experience, the windshield should be treated at least 3 times as often as all of the others, unless you have a rear wiper, than that window as well. Also, if you don't have lamin-x over your glass headlight housings, use it on the glass there as well (if it's not a plastic housing, then it's a big no-no.
#1 rule for rain-x, don't get it on ANYTHING except the glass, it will stain severely.