Iain kinnell
Well-known member
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- 59
What's the best way to take away black spot off Indian stone?
Thanks
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Hiarrrr the old indian sandstone the method i use is pressure wash using the flat surface cleaner this will clean well to a point (doesnt allways take off black lichen) then i would use my ips pro sprayer with a drum of sodium hypochlorite mixed with a surfacant and water spray on leave for 20mins then hard broom and wash away job done- orrrr sometimes a watering can with hypo mix lay it on hard broom wash way with tap job done if you have pictures may help-
Thanks for your replys will try thisyou can softwash only some jobs sometimes it takes mixture of both see image attatched there was 280 slabs with a pre soak of hypo then pressured washed (didnt touch it) so i had to wire brush black spot one by one to achieve this finish) 30 year old patio never been touched- this is an example of where pressure washer alone wont cut it- unless you had a hot washer this may have cut the mustard