How to Keep Mold Off of Limestone

Written by elton dunn
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How to Keep Mold Off of Limestone
Acidic cleaners can discolour limestone. (Jupiterimages/ Images)

Limestone makes an elegant natural stone paver for walkways, patios and special outdoor projects. However, the stone is porous, and can be tricky to clean, since you need to use cleansers that don't damage the stone. Combine natural prevention and best cleaning practices to ward off mould from taking over your pavers. If you do see mould, deep clean then get back to your best practices. Mold naturally grows outdoors, so combating mould, moss and other debris comes with the job of maintaining your home.

Skill level:
Moderately Easy

Things you need

  • Broom
  • Liquid dish soap
  • Bucket
  • Soft- or medium-bristled scrub brush
  • pH neutral cleanser

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  1. 1

    Sweep the limestone regularly to remove light dust and debris before problems arise. When you sweep, look over the pavers for signs of stains that could mould, such as spilt food or drink.

  2. 2

    Combine 1 tbsp of dish soap with 1 gallon of warm water to make a cleaning solution when you do need to scrub the limestone. Use a soft- to medium-bristled scrub brush to wash the pavers, dipping the brush in the soap solution, then wetting the paver. Scrub any stains you noticed earlier, until they come free. Regular cleaning prevents mould, so clean as often as you need to keep your limestone looking good.

  3. 3

    Rinse the pavers just after cleaning with cold water to remove all traces of soap.

  4. 4

    Clean your limestone with special pH neutral cleansers designed for cleaning the stone if you need more deep cleaning action. Limestone can dissolve or discolour from acidic cleansers, which include commercial cleansers and basic home products like lemon or vinegar. Apply the special pH neutral cleanser per the manufacturer's directions.

  5. 5

    Seal or have the limestone sealed to protect the finish. Impregnator sealer designed for use in porous stone lasts a long time and can repel oil and water-based stone, which cuts down on your day-to-day care.

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