Hard water (water that has a high mineral content) can cause white, opaque spots to stain the glass surface. This happens because of the buildup of alkali and various other minerals in the water. Even if the stain is difficult to remove, you can use a cleaner (liquid or non-liquid) to restore the glass to its luster again. There are also ways to prevent hard water stains from forming again once you've successfully cleaned them.
Step
Method 1 of 3: Using Cleaning Liquid
Step 1. Use an acidic cleanser for best results
Hard water stains are alkaline (alkaline) so the best material for removing them is a strong acid. Use cleaning products that contain sulfur, phosphoric acid, or hydrochloric acid which are very effective at breaking down stains. Read the instructions on the package and apply the cleaner to the stained area as directed.
- Acid cleaners are toxic so you should take safety precautions when handling them, such as wearing gloves and protective eyewear. Also, do not use it on surfaces that come into contact with food (eg kitchen counters).
- This product is perfect for use on acrylic and enamel surfaces, but can damage some other materials, such as marble, terrazzo, stone, polished or protective coated aluminum, and colored grout. To avoid damage, test the product in a hidden place before using it on the stained area.
Step 2. Make a mixture of water and salt
Use a water and salt mixture to remove any build-up minerals. The salt will act as a scrubber that will scrape off the stain. Apply the mixture on the stained area and rub the stain in a circular motion using a clean cloth. Rinse the glass thoroughly to remove any remaining salt water.
Step 3. Use white vinegar
Vinegar is an acid, which can loosen mineral deposits. White vinegar is colorless/clear so it doesn't stain. In addition, vinegar is also a natural liquid cleanser that is non-toxic and does not pose the risk of irritating the eyes and lungs like chemical cleaners.
- Add lemon juice to the vinegar for added effectiveness and give it a fresh lemon scent. Like vinegar, lemon juice (this ingredient is also acidic) also has the same effect on minerals.
- Put the lemon juice and vinegar mixture in a spray bottle, then heat it in the microwave for 20 to 40 seconds (depending on the power of the microwave). Warm cleaners are more effective at removing stains than cold or room temperature cleaners. Before putting it in the microwave, don't forget to remove the spray bottle cap so it doesn't explode.
- Spray this mixture on the glass and let it sit for 2 to 3 minutes before wiping it off with a paper towel or dry, lint-free cloth.
- To remove hard water stains from drinking glasses or other small objects, fill a basin with a mixture of water and vinegar (using the same ratio). Next, soak the stained item in the mixture for a few hours before rinsing it clean.
Step 4. Add the rinsing agent to the dishwasher
Rinsing products (such as Jet-Dry) can help remove hard water stains from dishes. Place the rinse product in the dishwasher where provided, add the dish soap you normally use, and then run the machine until the stained glass item is clean and shiny.
Step 5. Add ammonia to the cleaning products you use
Increase the strength of regular glass/window cleaning products by adding a little ammonia to remove hard water stains.
Step 6. Purchase another product at a hardware store
If commercial products can't remove the stain, look for a stronger cleaning product at a hardware store. However, be careful and always follow the manufacturer's instructions because this product is very strong and tough.
Method 2 of 3: Using Cleaner instead of Liquid
Step 1. Start by scrubbing the stain vigorously
Before buying expensive or toxic cleaning products, try scrubbing the stained object first.
- Use a soft, non-abrasive cleaning sponge to scrub the glass surface. Remove as much of the stain as possible by rubbing a damp sponge.
- You can use baking soda as an abrasive, but don't use a stiff-bristled brush or abrasive cleaner to clean the glass. Tools like this can damage the glass surface by causing scratches.
- This scrubbing method works best on small, fresh, hard water stains that are not yet firmly attached.
Step 2. Apply toothpaste
Many people use toothpaste to replace baking soda.
- Apply toothpaste to a dampened towel, then rub it over the stain in a circular motion.
- Wait a few minutes, then rinse off the toothpaste with a mixture of vinegar and water (using the same ratio) to remove any residue.
Step 3. Use a commercial cleaning paste
Some commercial cleaning products to remove hard water stains are produced in the form of a paste.
- The main advantage of paste-based cleaners over liquids is that they don't cause liquid stains or watermarks.
- The downside of paste is that it can blur the surface of the glass if you don't rub it over and over again. Always follow all the instructions listed on the product packaging so that this problem can be avoided.
Method 3 of 3: Preventing Hard Water Stains in the Future
Step 1. Prevent stains from forming
One of the best methods to get rid of hard water stains is to treat the source of the problem and improve the pH balance and mineral levels in the water.
- You can install a filter in the water line to remove the minerals contained in the water.
- You can also lower the water hardness by installing a water softener.
Step 2. Wipe and clean the glass surface regularly
You should clean hard water regularly so it doesn't dry out and cause stains.
- Dry the bathroom door after each use using a lint-free towel to remove adhering water.
- Clean the glass once a week or so to prevent stains from forming.
- Act quickly: the longer the stain stays, the harder it is to remove, and it can even stick to the glass surface permanently.
Step 3. Protect the glass from smudging in the future
Prevent hard water stains by coating or protecting the glass surface.
- On a glass table, use a placemat when you place the drink glass. The mat will accommodate spills and water droplets so as to prevent stains from forming on the glass table surface.
- On bathroom doors, try applying a wax-based protective coating once or twice a year. Water will not stick and only flows on the surface of the glass that has been given a coating so that the glass door remains clear and clean.
Tips
- If you are in doubt about a particular product, test it in a hidden place to prevent damage.
- If the stain hasn't gone away, spray the cleaner again, let it soak in, then wipe and clean. Repeat this process as needed.
- Try to use a cleaning sponge, not a cloth. Sponges tend to be stronger and less likely to scratch.
Warning
- Always follow the manufacturer's instructions on the product packaging and wear appropriate protective equipment (gloves, protective eyewear, and a mask) before using chemical cleaning agents.
- Do not add ammonia to bleach.
