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There's specialized glass waxes available but I don't see the need. I've found that glass polish made for cleaning glass cook tops works great and leaves the windshield with a coating that water just splatters off.
If you have light scratches or some other defect you need to fix, then some of the specialized glass polishes will be what you need.
Don't waste your time with waxing or applying RainX type products to your windshield unless you want to re-apply every time after cleaning your windshield.
All windshield cleaning products have ammonia or alcohol in them to prevent streaking. You are applying this ammonia or alcohol every time you use a cleaning product to clean your windshield.
What does every professional detailer recommend to remove wax from a finish....rubbing alcohol!
Even the RainX bottle tells you to remove excess product with rubbing alcohol.
Kind of a vicious circle if you wax or apply any sealants to your glass. Sealant on, then glass cleaner removes it. Think about it!
Use a good cleaning product like DP Glass Restorer to prep the glass and remove any dirt and grime. Then use a coating like Aquapel or CQuartz to protect the glass and help make glass water resistant. Both product offers months and more of protection. I would not however use a wax (carnauba based) on glass. A paint sealant (like Rejex) that is allowed to cure properly can indeed be a good choice, but use care in cleaning (ie. car soap) glass afterwards to get the longest protection.
Thanks guys. That was helpful info. Recently moved to FL And having a difficult time with water spots on paint and windshield. Wash in shade and dry ASAP but still an issue
Always try to keep the windshield clean as much as possible and I would use a glass polish after the alcohol wipedown to finish it up and from there would just keep it clean. It's one of the things about living in FL.