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recommendations svp for an effective cleansing fluid for terraces


mint

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With bleach, are you risking splashing it on your clothes/person when using in conjunction with a pressure sprayer?

I read somewhere that washing-soda crystals are effective against algae on paths. Haven’t tried it yet, though.
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I used to use the thick gel type javel straight from the bottle, squeezed on to the patio tiles, then work it in with a stiff brush, leave a few hours to react, then pressure it off. Very effective.

For vertical surfaces/steps, I used the 5 litre bottles of cheap stuff poured into a garden spray, pumped up, spray the surface, leave to react. Wear a mask if you are worried about breathing in the spray, and old clothes!
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Thanks, everybody.  I'm going to use the javel gel, as advised by lehaut.  Seems like the least hassle and nothing like working it in with a stiff brush to beat a session on the rowing machine?[:D]

Now just to wait for a break in the gusts of wind and rain to test a small patch isolated from the other areas.

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No ericd, maybe we need a better pressure cleaner[:-))]  Also, we can't jet it too fiercely as there is a concrete aggregate, small pebbles buried in concrete, making patterns on the terrasses and the pebbles can simply wash off....gggrrrr

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