glass water spots.
at my store we just use warm/soapy water, and then dry with coffee filters, the filters are coarse and really scrub the glass and leave it looking great, newspaper works great too but leaves your hands black.
use rain-x on all outside windows it takes a bit of elbow grease but you'll remove all the waterspots on the glass and have a fantastic finish that repels water. I do this everytime I wax the truck.
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Also, cheap glass cleaner. Use (1) teaspoon of ammonia,(1) teaspoon of dishwashing detergent (I use Dawn), and (1) cup of reg. alcohol, to a 32 oz spray bottle. (This will turn tinting that is aftermarket). But other than that a very cheap cleaner.



