Hard Water Stains on Glass

Try Vinegar (diluted in water, or full strength)

 

You can try Spotless which is designed for just that. I'm sure amazon has it or go to carpro-us .com


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Try the diluted vinegar first. Otherwise, a glass polish would be the next option. In the worst case scenario a product made of Cerium Oxide polish is used for very hard to remove water marks.

 

The clear spray window cleaners that have a touch of acetone in them remove mineral deposits and road grime nicely.

 

From a lemon or lime definitely works.

 

If those don't work, try lime away. It is for hard water scale removal.

 

Bar Keepers Friend Cleaner
Google it. Available most places household cleansers are sold.
I have used this for years on everything from Exotic Car windshields and windows to fine crystal.
Sprinkle a little on a moist micro fiber towel and rub. It does a great job of cleaning any glass surface with no damage to the glass. Also great for removing tree sap etc.
You may want to try something unimportant first to give you confidence in the product
Good luck

 

If you want to be a bit more aggressive, try .000 steel wool. Make sure there is plenty of liquid on the surface you're treating.

 

I second barkeepers friend, and it doesn't scratch the finish.

 

Thanks for the tip, worked great for me.

 

I have used DFI products with spectacular results:

Restoration Powder | Diamon-Fusion International

Restoration Powder 5oz

 

Do keep us posted.
I have never encountered anything that stubborn