How to remove blue-green stains from toilet bowl

Your toilet is a veritable sewer. It’s also something that you likely touch every day–perhaps your hands and face HuffPost Touch, too. But what goes down in the bowl needs to come out, right?

There are a variety of things that can go down the drain and leave unsightly blue-green stains on your toilet’s basin liner. These substances range from Brandon Juice to dye pen ink to fruit bits from your breakfast cereal bowl. Here are a few tips for removing these pesky stains…

If you have been struggling to get rid of blue-green stains from your toilet bowl, follow these simple steps: 1) Check the level of wastewater in the tank; if it’s low, add more water 2) Clear any plugged drains 3) Add a de-inking agent to your cleaning regimen 4) Use a cleaner specifically designed for toilets 5) Test the stain before using any of the above steps

What causes blue-green stains in toilet bowls?

Blue-green stains in toilet bowls are usually caused by copper in the water. Copper is a naturally occurring element that can be found in many water supplies. When water containing copper is exposed to oxygen, the copper oxidizes and turns blue-green. Although copper is not harmful to your health, it can cause staining in your toilet bowl.

Method 1: White Vinegar and Salt

One effective and environmentally friendly method to remove blue-green stains is by using a combination of white vinegar and salt. Here’s how you can do it:

  1. Dissolve a tablespoon of salt in a cup of warm vinegar.
  2. Soak a rag or cloth in the solution and place it directly on the stain.
  3. Allow the vinegar and salt mixture to sit on the stain for at least 30 minutes.
  4. Afterward, remove the rag and use a toilet brush to scrub away the loosened stain.
  5. Flush the toilet to rinse away the residue.

Method 2: Denture Tablets

Another natural and convenient option for tackling blue-green stains is by utilizing denture tablets. Follow these steps:

  1. Drop a couple of denture tablets into the toilet bowl.
  2. Allow the tablets to dissolve and fizz in the water.
  3. Let the mixture sit for approximately 30 minutes.
  4. Use a toilet brush to scrub away the loosened stains.
  5. Flush the toilet to rinse thoroughly.

Method 3: Chlorine Bleach or Sodium Peroxide

For more severe blue-green stains, chlorine bleach or sodium peroxide can be effective cleaning agents. However, it’s important to note that these chemicals are harsh and not environmentally friendly. If you decide to use them, follow these precautions:

  1. Put on protective gloves and ensure proper ventilation in the bathroom.
  2. Add a small amount of chlorine bleach or sodium peroxide to the toilet bowl.
  3. Let it sit for about 15-20 minutes to allow the chemicals to work.
  4. Use a toilet brush to scrub the stained areas.
  5. Flush the toilet multiple times to thoroughly rinse away any residue.

Method 4: Vinegar and Baking Soda

Vinegar and baking soda, known for their versatile cleaning properties, can also be combined to remove blue-green stains effectively. Here’s how to use this method:

  1. Create a paste by mixing vinegar and baking soda until it reaches a thick consistency.
  2. Apply the paste directly to the stained areas of the toilet bowl.
  3. Let it sit for a few minutes to allow the paste to work its magic.
  4. Use a toilet brush to scrub away the stains vigorously.
  5. Flush the toilet to rinse away any remaining residue.

Method 5: Muriatic Acid

Warning: Muriatic acid is an extremely powerful and dangerous chemical. Use extreme caution when handling it, and always follow the manufacturer’s instructions and safety guidelines.

Muriatic acid is a potent cleaning agent that can effectively remove mineral and rust stains from a toilet bowl. However, it should be used as a last resort due to its hazardous nature. If you decide to proceed with this method, follow these safety precautions:

  1. Put on protective gloves, goggles, and a face mask.
  2. Dilute the muriatic acid according to the manufacturer’s instructions.
  3. Apply the diluted acid to the blue-green stains, ensuring it does not come into contact with other surfaces.
  4. Allow the acid to sit for a short period, usually less than five minutes.
  5. Using a toilet brush, scrub the stains vigorously.
  6. Rinse the toilet bowl thoroughly by flushing multiple times.

Method 6: Vinegar and Salt Overnight Treatment

For persistent blue-green stains, an overnight treatment using vinegar and salt can be highly effective. Follow these steps:

  1. Pour 3 cups of vinegar into the toilet bowl.
  2. Spread 3 cups of salt over the vinegar, ensuring it sticks to the wet surface.
  3. Allow the mixture to sit for several hours or overnight.
  4. Use a toilet brush to scrub away the loosened stains in the morning.
  5. Flush the toilet repeatedly to remove any remaining residue.

Preventing Blue-Green Stains

To prevent blue-green stains from reappearing in your toilet bowl, consider the following preventive measures:

  1. Regularly clean and maintain your toilet bowl to minimize the accumulation of mineral deposits.
  2. Use water softeners if you have hard water, as it can contribute to stain formation.
  3. Inspect and replace any corroded or faulty plumbing components that may be causing the stains.


Removing blue-green stains from a toilet bowl may require different approaches depending on the severity and underlying cause of the stains. From natural remedies like white vinegar and salt to powerful cleaning agents like muriatic acid, there are various methods available to tackle these stubborn stains. Always prioritize safety and environmental considerations when selecting a cleaning method. With the techniques outlined in this article, you can effectively restore the cleanliness and freshness of your toilet bowl.


  1. Can I use lemon juice instead of vinegar to remove blue-green stains? While lemon juice has some cleaning properties, it may not be as effective as vinegar in removing blue-green stains. Vinegar contains acetic acid, which helps break down mineral deposits and stains more efficiently.
  2. Is it safe to mix bleach and vinegar to remove blue-green stains? No, it is not safe to mix bleach and vinegar together. This combination can produce toxic fumes and should be avoided. If you choose to use bleach, do not mix it with other cleaning agents.
  3. Are there any eco-friendly alternatives to harsh chemicals for removing blue-green stains? Yes, there are several eco-friendly alternatives available. Some options include using natural cleaners like baking soda, vinegar, or hydrogen peroxide. These alternatives are safer for the environment while still effectively removing stains.
  4. Can I use a pumice stone to remove blue-green stains from the toilet bowl? While pumice stones can be effective in removing certain types of stains, they are not recommended for use on porcelain surfaces like toilet bowls. Pumice stones can scratch the surface and cause damage.
  5. Why do blue-green stains keep coming back even after cleaning? Blue-green stains may keep reappearing if there is an underlying issue, such as corroded pipes. In such cases, it is advisable to seek professional plumbing assistance to address the root cause and prevent further staining.

Sharing Is Caring:

Camilo Kawas is a seasoned entrepreneur and expert in the field of commercial cleaning, with a specific focus on clothes, carpet cleaning and floor care. With a profound understanding of the importance of selecting the right products for effective stain removal from clothes, Camilo has established himself as a trusted authority in the industry.

Leave a Comment