How to Get a Blue Stain Out of a Tub Drain

eHow may earn compensation through affiliate links in this story. Learn more about our affiliate and product review process here.

Things You'll Need

  • 1 cup ammonia

  • Cloth

  • Toothbrush

Blue stains can begin to develop in your bathtub's drain if you have copper or brass pipes or plumbing fittings. This is because the brass or copper oxidizes and small amounts of it are left on the bathtub's surface. Luckily, you can often remove this stain the same way you would remove any other mineral deposit on your bathtub. Clean the blue stain as soon as you notice it to prevent the blue color from soaking into the tub where it may be harder to remove.

Advertisement

Step 1

Mix 1 cup ammonia with 1 cup water.

Video of the Day

Step 2

Dip a cloth into the ammonia mixture and place the cloth over the blue stain. Let the cloth sit on the stain for at least 20 minutes. This will give the ammonia time to loosen the stain.

Step 3

Remove the cloth.

Step 4

Dip a toothbrush into the ammonia mixture and brush away the rest of the blue stain.

Step 5

Rinse the area with clear water.

Advertisement

Video of the Day

references