Cleaning Concrete Yard

[Mags22]

Any tried and tested tips for getting patches of green yuk off my concrete yard, deposits from overhanging shrubs next door?

[jno]

bleach and hose down? Works here. Plus I think there's proprietary stuff you could try, but I don't know how well it works

[Ouzel]

You could try either a power washer or a strong solution of soda crystals and a stiff brush, followed by a hose down.

[Gavmacp]

Power washer!

[Mags22]

Have a power washer but doesn't get it all, will try bleach, then soda if that doesn't work.Used some proprietory stuff but wasn't very effective. Thanks for replies

[shiznit]

I have heard people use washing powder before now, not sure which kind, but I'm assuming it would be biological rather than non bio

[The Builder]

Buy a simple sand-blasting attachment for your pressure washer, Mags. That'll shift anything.

[RATTER15]

I use a Karcher pressure washer. If its an ongoing problem, for about£200 you will have it solved, mine came with a concrete scrubbing device that fits to the end of the lance, I haven't had the need to use that yet as the water pressure lifts off the green yuk easily in a few seconds.

[Gizmonster]

We've got a Karcher power washer and our patio has a small run-off that often gets green with the water running off it. The power washer has never fully shifted it - tried bleach and all kinds of other detergents.
Anyway, when we had our drive done, the firm recommended a product called "Dairy Hypochlorite".
I now use this to clean all of the patio (no need to get the power washer out anymore), I was that impressed with it, I even showed my neighbour. She commented how it looks like new ... and she wants me to get her some, the next time I get some :)

[janbee]

I always use bleach, nothing fancy, just plain old bleach and then a stiff brush and then a hose down. Voila... all twinkly and clean... until it all comes back again of course, especially after all the rain we've had over the past few months.

[wired]

Fao Gizmonster, what dilution do you use as that's very strong stuff and does it lighten,permanently, the patio?

[Gizmonster]

To be honest, I can't remember the dilution that I used.
It's actually used in the cleaning of the lines, etc in the dairy industry .... as the name suggests :)
I rang the firm up, that supplied it and asked them if it was okay to use it to clean the patio. I was told yea and was also told what dilution to use .... I've forgotten what they said, so when I need to use it again, I'm gonna have to ring them again. This time I'll make a note of the dilution on the container itself :)

[bunkmoreland]

Plain old fairy liquid solution worked for me,and path had got very slippy.

[condor66]

We use hypochlorite bought from farm supply shop, works a treat!