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Try Bon-Ami dry. It won't scratch the glass. Sprinkle some on a towel and rub it into the glass. Doing so will remove any crap from the glass.
I've stopped using Rain-X and have switched to Gtechniq products. Here's what I did:
- twice thoroughly scrubbed the glass with my homemade glass cleaner*
- used Bon-Ami and a clean towel to remove remnants of Rain-X
- cleaned the glass with my homemade glass cleaner
- used G4 Glass Nano Polish to properly prepare the glass
- applied 2 thin coats of Gtechniq G5 Water Repellent Coating
* 60% by volume of water, 20% by volume of 70% isopropyl alcohol, 20% by volume of distilled white vinegar and 8 drops of Dawn in a 2 liter bottle. Shake well.
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