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  stephen murray-cook February 10, 2013 at 10:51am
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  stephen murray-cook February 10, 2013 at 10:53am

  there is a link on paving expert am sure mick g will put it here its a make your own and good stiff brush petrol pressure washer would do for final clean cheers cookie

  found it http://www.pavingexpert.com/stains.htm#algae
• PRO

  Mick Gammage February 10, 2013 at 11:00am

  Two links below from Paving Expert on cleaning paving flags

  Cleaning Paving

  Black Spots and Lichen
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  Keith Barker February 10, 2013 at 11:58am

  Thanks chaps!
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  Torin February 10, 2013 at 12:34pm

  Hi Keith

  As a last resort and only on concrete flags,try diluted brick acid, a stiff scrubbing brush and the pencil jet from a pressure washer to clean up ! Always do a test patch first,, where gloves, mask and goggles and never use acid on a natural stone !

  All the best
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  stephen murray-cook February 10, 2013 at 1:26pm

  hi i use acid on natural stone @32percent proof when we clean of slurrey pointing you should not use on limestone paving and as all ways do a small test first
  there are non acid cleaners out there but lots of money
  Torin said:

  Hi Keith

  As a last resort and only on concrete flags,try diluted brick acid, a stiff scrubbing brush and the pencil jet from a pressure washer to clean up ! Always do a test patch first,, where gloves, mask and goggles and never use acid on a natural stone !

  All the best