How to Remove Mortar Stains and Smears

Mortar is a paste effectively used to bind bricks, construction blocks and to fill the gaps between the tiles. However, mortar stains and smears make the surface look ugly. Removing these stains and smears may look hard if you have not done it in the past, but it is not that tough. You can easily remove mortar stains using a few readily available household and chemical products.

Things Required:

– Power Washer
– Muriatic acid
– Stiff-bristled brush
– Extension pole
– Garden Hose with spray nozzle
– Bucket
– Water
– Rubber Gloves
– Safety Glasses


  • 1

    Spray power washer over stains

    Spray liberally power washer on the stained area and let it stay for a while before wiping it off with a rag or paper towel. This will remove excess of mortar from the surface.

  • 2

    Dilute muriatic acid with water

    Take a plastic bucket and pour one gallon of water into it. Take 1 ½ ounces of diluted muriatic acid and add it slowly to the bucket containing water. Mix the solution well; however, be careful not to splash the acid, since it can burn your skin.

  • 3

    Make cleaning solution

    Now mix this acid solution with water in a one to ten ratio, that is one part of cleaning solution and ten parts of water. Cleaning solution of this strength is effective in removing light to moderate mortar stains. Increase the strength of the cleaning solution gradually if the stains are tough and stubborn.

  • 4

    Prepare the surface for cleaning

    Make sure the stained area is wet before you start treating it with the acid cleaning solution. If not, wet it with water using a garden hose with a  spray nozzle. Meanwhile, take a stiff brush and place it in the bucket containing the cleaning solution. This will saturate the brush before you use it on the masonry.

  • 5

    Clean it

    Pour the cleaning solution on the affected area and scrub the stains using the stiff-bristled brush you had soaked in the solution. Keep scrubbing the surface thoroughly for almost three minutes and then rinse off with the garden hose. Repeat this process if required.

  • 6

    Rinse the area thoroughly

    Once you are sure all the stains are removed, rinse the area thoroughly using an excess of water to remove the acid residue.

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