How to Remove White Plaque in a Spa


Body oils, dirt, scum and hard water minerals like calcium and lime combine to coat the walls of spas and hot tubs with a white plaque known as "scale" or "limescale." Scale is one of the most stubborn stains to remove unless you use the right chemicals. Many solutions for removing scale are available at pool and spa supply stores, but all you need to clean your spa is a mild acid and a mild detergent.

Things You'll Need

  • Spray bottle
  • Vinegar
  • Dish detergent
  • Scrub brush
  • Garden hose
  • Drain all of the water from your spa so you can easily clean the walls and floor.

  • Fill a spray bottle with equal parts water and either white distilled vinegar or apple cider vinegar. Add about 1 to 3 tbsp. of dish detergent to the bottle. Lightly shake the bottle to incorporate all of the liquids.

  • Spray the entire surface of the spa with the solution and allow it to soak in for five to 10 minutes.

  • Spray the surface of the spa again and scour with a scrub brush. Scrub the walls and floor of the spa until the white plaque disappears. Spray the surface with more of the solution if any of the residue remains.

  • Rinse the spa thoroughly with a garden hose to get rid of the solution and any bits of plaque. Allow the spa to drain and use the hose to push any plaque particles through the drain.

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