How to remove stubborn stains from porcelain bathtubs


So you are ready to remodel your bathroom, but your old porcelain tub isn’t up to par? Neglecting cleaning porcelain bathtubs allows dirt, soap scum and stains from water to accumulate. The longer the dirt on the porcelain, the harder it is to clean. As the abrasive can scratch the porcelain, it is best to remove these stains fast.

You will need

  • 2 oz. (60 g) of baking soda
  • 2 oz. (60 g) of ammonia for home
  • Pail Sponge nylon
  • 2 soft cloths 1 tablespoon disodium phosphate
  • Gloves
  • Nylon Brush
  • White towel


  1. Mix 2 ounces (60 g) of dry baking soda and 2 oz. (60 g) of ammonia to 1 quart (0.90 L) of water warm. Combine them in a bucket.
  2. Rub the hot porcelain with solution of baking soda and ammonia with a nylon scrubber. Take away all the soap scum buildup and stains of water as you can.
  3. Dampen a clean cloth with warm water and rub the porcelain with the same rinse ammonia and sodium bicarbonate. Rinse well the hot porcelain.
  4. Inspect the porcelain to see if it were dirt, stains with soap or water. If so, dilute 1 tablespoon of disodium phosphate in 1 gallon (3.79 l) of water hot. Stir the dissolved disodium phosphate in a clean bucket using rubber gloves.
  5. Scrub the porcelain with solution of disodium phosphate using a nylon brush. Rinse the solution, dirt, soap scum and spots of water in the tub.
  6. Dampen another soft, white cloth with warm water and rub the porcelain with the same disodium phosphate to remove. Rinse the tub well.
  7. Rub the tub with a white towel.

Tips and Warnings

  • You can use chlorine bleach instead of disodium phosphate, but this fixed permanently stains the tub.
  • Rub the sides of the tub with lemon oil to prevent tough stains and brighten.
  • Try the solution of ammonia and disodium phosphate in an inconspicuous area of the porcelain to prevent damage.
  • Never mix the solution of disodium phosphate with other cleaning products.

Use these tips, and you’ll be on your way to a beautiful new bathroom!