mint Posted March 4, 2020 Share Posted March 4, 2020 Terraces, mostly stone paving slabs with some concrete aggregate, stained and dirty looking: so something to use in conjunction with the pressure jet cleaner. Thanks. Link to comment Share on other sites More sharing options...
pip24 Posted March 4, 2020 Share Posted March 4, 2020 Diluted javel ? Link to comment Share on other sites More sharing options...
mint Posted March 4, 2020 Author Share Posted March 4, 2020 Could try, I suppose, Pip though a couple of cats seem to like visiting and I don't know if it could harm them? Link to comment Share on other sites More sharing options...
Kong Posted March 4, 2020 Share Posted March 4, 2020 Javel is fine, keep it away from plants. It breaks down quite quickly leaving fairly harmless residues (ie salt). Rinse thoroughly. Link to comment Share on other sites More sharing options...
Loiseau Posted March 5, 2020 Share Posted March 5, 2020 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. Link to comment Share on other sites More sharing options...
Lehaut Posted March 5, 2020 Share Posted March 5, 2020 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! Link to comment Share on other sites More sharing options...
mint Posted March 5, 2020 Author Share Posted March 5, 2020 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. Link to comment Share on other sites More sharing options...
betise Posted March 5, 2020 Share Posted March 5, 2020 I usually use a pressure washer with eau de javel, but, to reduce the risk of clothing damage, do it early in the morning, in the nude. Luckily we live far from the madding crowd! Link to comment Share on other sites More sharing options...
mint Posted March 6, 2020 Author Share Posted March 6, 2020 Betise, I hope you are not doing THAT in this time of high winds and heavy rain! Just thinking of you doing that is enough to bring me out in goose pimples (chair de poule)[:D] Link to comment Share on other sites More sharing options...
alittlebitfrench Posted March 6, 2020 Share Posted March 6, 2020 I would just start with a pressure hose and water mint and go from there. Link to comment Share on other sites More sharing options...
mint Posted March 6, 2020 Author Share Posted March 6, 2020 Have done that, ALBF, and the stains don't look good at all. Link to comment Share on other sites More sharing options...
ericd Posted March 11, 2020 Share Posted March 11, 2020 Having used the Karsher on some very dirty old stones, I am questioning the need for any Javel like product.Would the pressurised water not be sufficient? Link to comment Share on other sites More sharing options...
mint Posted March 11, 2020 Author Share Posted March 11, 2020 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 Link to comment Share on other sites More sharing options...
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