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Thread: Mortar spots on deck - cleaning

  1. #1
    Join Date
    Sep 2007
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    Ames, IA
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    Mortar spots on deck - cleaning

    I accidently got a little sloppy and tracked some mortar onto my deck boards (Trex brand). It's dried. Now, I need to remove them. I've used a solution of TSP & water using a stiff scrub brush. This seems to work, but is slow, tough. Does anyone have other cleaning agent solutions. My wife has reminded me to be "less sloppy" next time

  2. #2
    Join Date
    Sep 2016
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    Modesto, CA, USA
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    Bleach or any other acid will dissolve it. Check first to see if it bleaches the color out in a inconspicuous area.

  3. #3
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    Bleach is not an acid, it is actually an alkali. Generally masons use muriatic acid and a stiff brush to wash mortar residue off bricks. If the Trex has a plastic coating you should be good to go with muriatic acid, if it is the old style composite Trex, test it first in an inconspicuous area. Just rinse it well when you are done. The longer you let the cement cure, the more difficult it is to remove.
    Last edited by Ole Anderson; 10-15-2019 at 10:22 AM.
    NOW you tell me...

  4. #4
    Join Date
    Sep 2007
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    Ames, IA
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    Quote Originally Posted by Ole Anderson View Post
    Bleach is not an acid, it is actually an alkali. Generally masons use muriatic acid and a stiff brush to wash mortar residue off bricks. If the Trex has a plastic coating you should be good to go with muriatic acid, if it is the old style composite Trex, test it first in an inconspicuous area. Just rinse it well when you are done. The longer you let the cement cure, the more difficult it is to remove.

    Ole,thanks for the suggestion. I previously considered Muratic acid but withdrew due to possibly being too harsh. However, I tried it on a inconspicuous spot, worked good. So, I continued with all the areas, and it worked GREAT. A key was to rinse very thoroughly. Thanks, again, for your recommendation.

    Bob O

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