I've been dealing with hard water spot on my windows for a while now. I tried the vinegar water solution, rubbing compound, ultimate compound, M105, M205..and the list goes on and on. These products really did nothing to get rid of the water spots but smear the windows and required a lot of effort for minimum results.
Today, with a help from various car detailing forums, I purchased a product that works. It's cheap, easy to use, very effective and my windows are looking super clean and fresh.
Product: Bar Keepers Friend
Cost $1.79
This product comes in a powder solution. All I did was dump some of the solution on a cup and mix some water to make a paste. Let it sit for like a min and take either a foam applicator or a microfiber towel to apply.
1. Clean the window
2. Wet the surface you want to apply the solution
3. Apply the paste solution with foam applicator or microfiber towel ( wear gloves and keep the solution away from plastic/rubber trim)
( you will hear and feel like your sanding the glass.. it's the product dissolving the hard water minerals )
4. Wash the solution off with clean water and or glass cleaner with a MF towel.
5. Repeat on other windows if needed.

Today, with a help from various car detailing forums, I purchased a product that works. It's cheap, easy to use, very effective and my windows are looking super clean and fresh.
Product: Bar Keepers Friend
Cost $1.79

This product comes in a powder solution. All I did was dump some of the solution on a cup and mix some water to make a paste. Let it sit for like a min and take either a foam applicator or a microfiber towel to apply.

1. Clean the window
2. Wet the surface you want to apply the solution
3. Apply the paste solution with foam applicator or microfiber towel ( wear gloves and keep the solution away from plastic/rubber trim)

( you will hear and feel like your sanding the glass.. it's the product dissolving the hard water minerals )
4. Wash the solution off with clean water and or glass cleaner with a MF towel.
5. Repeat on other windows if needed.
Last edited: