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    Kstar4u's Avatar
    Kstar4u Posts: 255, Reputation: 22
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    #1

    Jun 4, 2007, 11:30 AM
    Remove mortar stains
    What's the best method for removing mortar stains from faux rockwork? The mortar is about a week old and there is a residue that covers the rock and prevents it from matching the surrounding rockwork surfaces.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Jun 4, 2007, 01:50 PM
    First try something not too strong like spaying with 50/50 vinegar and water and allow to soak. If its outside power wash from about 12" away. If it doesn't work try staright vinegar before we move to diluted muratic acid.
    glavine's Avatar
    glavine Posts: 895, Reputation: 87
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    #3

    Jun 4, 2007, 06:45 PM
    Diluted muratic acid, it will eat the rock right off your mortar lol
    Wear some gloves and safety googles.
    Kstar4u's Avatar
    Kstar4u Posts: 255, Reputation: 22
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    #4

    Jun 4, 2007, 06:47 PM
    I'm a little hesitant to use muriatic acid... it IS faux rock.
    glavine's Avatar
    glavine Posts: 895, Reputation: 87
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    #5

    Jun 4, 2007, 07:19 PM
    You May Try A Course Scrubbing Brush And Use Something A little Less Toxic
    Kstar4u's Avatar
    Kstar4u Posts: 255, Reputation: 22
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    #6

    Jun 8, 2007, 01:13 PM
    Thanks for all of your suggestions. I ended up using an architectural concrete cleaner/brightener. After I got to the job and read the label further... I realized that I had spent $20 on a dilute muriatic acid. It worked pretty well, though. For some reason it bleached the grout somewhat but I ended up with a satisfied customer. Now... if I could only get paid for the job. It was one of those darned "escrow" jobs.
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