How to remove light mortar stains?

Discussion in 'Hardscaping' started by Garyl53, Aug 25, 2008.

  1. Garyl53

    Garyl53 LawnSite Member
    Messages: 22

    I put some mortar in the back of the joints of a red sandstone wall to provide some support for the top row of stone that was sliding all over the place. It rained and now there is a little mortar film on the front of a few of the stones. Water and scrubbbing did not do anything. Is there a cleaner that can be used that will not harm the red sandstone?

    JLAWNCARE LawnSite Member
    Messages: 42

    acid wash it
  3. Garyl53

    Garyl53 LawnSite Member
    Messages: 22

    I was concerned that the acid would discolor the red sandstone. I guess I can try it on a small piece before I try it on the wall.
    Any other ideas?
  4. orionkf

    orionkf LawnSite Member
    Messages: 122

    Water it down, throw some sand on it, and scrub it around. If it's light and fresh it might work.
  5. richallseasons

    richallseasons LawnSite Senior Member
    Messages: 479

    muriatic acid, dilute it 50% with water and use a stiff bristle brush, it will not hurt the stone. make sure you hose it down good when you get the disired result
  6. bike5200

    bike5200 LawnSite Member
    from Ky
    Messages: 55

    Try Vinegar, it is a acid, use it to clean ceramic tile, use it on some glass block too. If you have cement on you hands, Vinegar will clean it off with out burning the skin.
  7. Ramairfreak98ss

    Ramairfreak98ss LawnSite Silver Member
    Messages: 2,210

    I think efflorescence cleaner "in a bottle" dilluted would work for this too. I know it works on paver stains, and stuff like lime and calcium buildups and deposits that may be on pavers or flagstone. Its sold by most hardscape suppliers in a gallon for $20-30. Dillutes down a lot so it lasts a while, foams up when brushing it on the area your cleaning.

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