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Cleaning patio slabs

i got Grey Indian sandstone slabs over a year ago ?a large area was put down and love it 
about a 1/4 of it has become slightly green and don’t fancy scrubbing it 🙈🙈
would a chemical like patio magic or pressure washer be ok as looking to buy new washer once outdoor tap get fitted 


  • Joyce21Joyce21 Posts: 15,489
    I use a pressure washer on my sandstone slabs.
    SW Scotland
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  • KT53KT53 GloucestershirePosts: 7,552
    Joyce21 said:
    I use a pressure washer on my sandstone slabs.
    Me too. Quick and easy with no chemicals.
    Me three :) There's a special brush for cleaning slabs which greatly reduces the mess you would get from just using a conventional lance and spray head.
  • amberspyamberspy Posts: 379
    Thanks guys yeah saw the pressure washer with round brush head I take this will help do the job 
    does anyone use the soap to or just plain water 
  • Joyce21Joyce21 Posts: 15,489
    Just water Amberspy.
    SW Scotland
  • Lizzie27Lizzie27 SomersetPosts: 10,531
    We have sandstone paths and steps right round the house but it takes me about 6 hours to clean it all, and I then have to get a hosepipe out to wash all the dirty water away - and re-mortar the cracks between the slabs. What am I doing wrong?
  • Hostafan1Hostafan1 Posts: 33,315
    @Lizzie27, ask a friendly builder, but maybe up the ratio of cement to sand in the mortar mix to make it harder to dislodge.
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  • Lizzie27Lizzie27 SomersetPosts: 10,531
    Thanks Hostafan, I was recommended to re-mortar the easy way by brushing the dry ready made mix into the cracks and wait for it to rain - but it didn't! Then tried a watering can but think it wasn't enough. Went back to Patio Magic as I find it easier to apply but it is expensive for lots.
  • LynLyn DevonPosts: 21,143
    The patio attachment is quick and gentle to use.  The jet will remove the cement grouting. 
    Gardening on the wild, windy west side of Dartmoor. 

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