Hard Water Stains on Auto Glass

How do I remove hard water spots on vehicle windows, that have been driven and exposed to all sorts of elements? Besides hard water stains, there are other unknown spots. Thank you.



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November 13, 20100 found this helpful

Vinegar. I use it in my dishwasher and on my stainless steal sink. What a difference!

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October 20, 20171 found this helpful

All different answers here! Sadly, none of them worked for me. I have Marvin Windows which rot, but that is another story. Can't use even a green scrubber pad on these awful Marvin windows as the teeniest, tiny abrasive scratches them forever.

Step 1
But the list inspired me.

Step 2
After trying most of the remedies with absolutely no results...I even tried hydrogen peroxide.

Step 3
Then I had a ureka moment. Maybe lime could be the antidote to hard or mineral water stains. After all, it's in one of those cleaning products you pay for that contains mostly water.


Step 4
I have a 40 pound bag of powdered lime in the garage. You know the kind you put on your garden? It cost about $4 last spring at that big store everyone complains about but frequents due to the prices.

Step 5
I put some powdered lime in a mason jar with a little water and stirred with a chopstick to make a paste. You can stir with whatever you want, but this is a good excuse to get Chinese food!

Step 6
The paste tends to harden up after a while, but just add more water. I rubbed it around on a small area of spotting. It doesn't have to go on thick, the paste is just a method for getting the lime to stick on the window.

Step 7
It was about time for my mid morning coffee break so I did that.

Step 8
When I came back, I used a soft rag to buff off the dried lime.


To my shock and amazement, the glass was spot free and shinny as a new penny! And, no window scratches! The area I hadn't treated stood out with nasty spots.

Step 9
Here are a few things you might want to know.

Step 10
I used disposable gloves when handling the lime and paste, and even the buffing. Be careful to avoid inhaling the lime before you put water on it.

Step 11
Don't use pelletized lime unless it makes a paste, if you spread particles from the pellets on your windows, you may scratch them.

Step 12
I used damp paper towels to spread the paste. The lime will harden on the towel very quickly. I just dumped it back in the jar. Don't put the paper towels in the trash, put them in your compost or bury them in your garden. If you use rags to buff...you can use paper towels for this as well..wash the rags at an outside faucet. I am not sure what lime does to the benificial microbes if you have a septic system.


Step 13
It works much better if you apply the paste and let it sit a while. If some of the spots don't come off on the first go, try again. I did that and it worked. Maybe I didn't get enough lime on them the first time.

Step 14
I would be thrilled to hear how it works for others as this is the first time I have posted on a site like this. Good luck!

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