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Replies

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  phil smith yewtreelandscapes.com January 21, 2016 at 10:48pm

  try calling dt stone down in fordingbridge, 01425 654011

  http://www.dtstone.co.uk/inside-natural-limestone-flooring.html

  phil
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  Steve London Stone January 22, 2016 at 7:09am

  Hello David
  
  Sorry to ask the obvious but is there a specific site reason why has it got to be acid free?
  
  Steve
  • 

    phil smith yewtreelandscapes.com > Steve London Stone January 22, 2016 at 7:47am

    a lot of indian or sand stone has natural metals in it, normal brick acid can make the metals rust and rust spots will appear on the surface of the slabs, i remember someone posting pics on here a few years ago

    phil
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      David Marsh > phil smith yewtreelandscapes.com January 22, 2016 at 7:55am

      Phil is right I have used brick acid before and it damaged the surface of the stone flags might have to use the mn builders clean again. Someone told me to try vinegar I have to repoint the flags after I clean them up
• PRO Supplier

  Progreen Weed Control January 22, 2016 at 8:49am

  Safety Klean might do the job - never used it but seen it recommended. www.tensiduk.com 

  Safety Klean is an effective, safe alternative to acidic compounds for cleaning brick, tile and concrete surfaces. Safety Klean rids new masonry construction of excess mortar, dirt and other common job site soiling. It is ideal for projects where traditional acidic cleaners are not permitted. Non fuming Safety Klean contains no hydrochloric or other traditional inorganic acids and is safe for use on and around most metal surfaces, indoors or out. It is up to 70% more effective than citric and glycolic acids, and 50% more effective than phosphoric acid.
  • 

    David Marsh > Progreen Weed Control January 22, 2016 at 8:52am

    who sells that in the uk? also seen this in b and q

    http://www.diy.com/departments/ecochem-brick-mortar-cleaner-1l/3568...
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      David Marsh > David Marsh January 22, 2016 at 9:56am

      The safety klean is 94 quid for 15 litres so that's out. Anything else I could use.
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  Steve London Stone January 22, 2016 at 10:33am

  Yeh, brick acid is a definite no no but there are other acid based products that can be used.  I have regularly used Lithofin Builders clean (acid based) on Sandstone (NEVER USE IT ON LIMESTONE!!!) and never experienced any issues.  Start of by diluting it 10/1 and incrementally increase the dosage if required.  This should shift the mortar stains.  If your unsure do a test patch first in an indiscrete area

  Cheers

  Steve
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    David Marsh > Steve London Stone January 22, 2016 at 11:10am

    Ordered some builders clean off amazon the one you said cheers
    • 

      Steve London Stone > David Marsh January 22, 2016 at 1:03pm

      Let us know how you get on