I had a glass vessel, and several glasses passed to me from my mother-in-law. Unluckily, she washed them for several years with hard water from the well. I tried getting rid of hard water stains, but it was not an easy task. I did a bit of research and came up with several methods on how to remove hard water stains from glass. Hard water stains commonly form on the glass after the water containing high levels of magnesium or calcium evaporate on the surface. When these mineral dissolves, they leave cloudy or white spots that are hard to remove using standard cleaning detergents.
Below are several methods I tried to remove hard water stains. How to remove hard-water stains from glass：
1. Using elbow grease
The first method I tried is the scrubbing method. By using cleaning pads, you can scrub the glasses to remove the stains. However, ensure you do not scratch the surface. This technique works well on smaller hard water stains or new stains that are not firmly set in.
2. Using baking soda
If you are trying to remove older hard water stains like mines, or a significant area build-up, elbow grease will not work. Baking powder is an adequate remedy that can help you remove the stains. Remember, baking soda is an alkaline. Hence, it can be used to remove mineral deposits. It is natural, environmentally friendly, safe and an excellent product to clean the glasses.
There are two methods for using baking soda to remove the stains. You can mix the baking soda with vinegar to make an active paste, or apply vinegar first to the stain, then apply baking soda.
3. Using a toothpaste
A good alternative to baking soda is toothpaste. You only need to apply the toothpaste to a wet towel, and then rub it over the hard water stains.
Wait for 15 to 30 minutes, and then rinse off the paste to remove the residue.
4. Using commercial paste cleaners
You can get several commercial cleaners for that water stains. The benefit of using paste cleaners over liquid detergents is that a paste cleaner will leave its watermarks. However, it is essential to follow the instructions to avoid any side effects. Most people damage the glasses after failing to follow the instructions.
5. Using white vinegar
Using white vinegar to loosen mineral deposits can help a lot because it is an acid. Since it is colorless, be assured that it cannot cause staining. It is also a cleaner that is natural and cannot burn your lungs or eyes like many other cleaners. Vinegar is also an excellent product for removing other stains on utensils.
6. Using a mixture of water and salt
Some people may disagree that a mix of water and salt can be used to remove hard-water stains. Salt acts as a cleaning powder and helps to remove the mineral buildup. Just apply the mixture to the affected part, then use a clean piece of cloth to rub the stain. Then rinse the glass well after cleaning, to get rid of salt water residue.
7. Consult your hardware keeper
If you have tried the above techniques, but you cannot the get desired results, get help from your local hardware shop. There you can be guaranteed to get some help.
Bottom-line One thing I learned is that it is crucial to stop the stains before they form. You can do this by intervening at the source or removing the minerals in the water by a filter to your water system. In case, it is hard to purify the water, make sure you wipe and clean the glass surfaces thoroughly.
Here, you will be able to prevent the hard water from turning into a stain. Remember, the longer a stain sits on the glass, the harder it is to remove. If you are not confident of any of the above methods or products, you can test it in an ordinary place to avoid any damage. If the hard water stains persist, repeat the process. Try using sponges instead of cleaning cloth. Also, make sure you protect your glasses from future stains by safeguarding or sealing the surfaces. For shower doors, you can use a wax-based protective coat every year, and for the glass table, using coasters under drinking glasses will help a lot.