Grout/cement stains on a patio

fryup

Is there any effective way of removing Grout/cement stains from patio slabs?

They should be dark grey....when i scrub & wash them they just revert back to the faded colour

Clarabel

fryup wrote: »

Is there any effective way of removing Grout/cement stains from patio slabs?

Thanks,

Don't laugh but I've been using CIF. Put a good bit on, leave it a few hours. Then I use a paint scrapper and brute force, but the CIF softened and dissolves it.

I've been doing this on tiles though. I'd test an area first because the CIF discoloured some items I used it on.

dodzy

Lithofin cement away + wire brush and a hose/powerwasher would be your best bet. Acid based as far as I recall so glasses and gloves too.

fryup

i've used cemstrip and found it useless....has anyone used santrax concrete cleaner ??

madmac187

fryup wrote: »

i've used cemstrip and found it useless....has anyone used santrax concrete cleaner ??

Did you try brick acid ? For removing mortar stains off brick that could do it tbh

fryup

brick acid? but isn't that what cemstrip and santrax basically is?

any product in particular ?

madmac187

fryup wrote: »

brick acid? but isn't that what cemstrip and santrax basically is?

any product in particular ?

It is my bad wasn’t too sure tbh. But try it in varying degrees of concentration

listermint

Did you follow the guidelines? Aren't you meant to leave it to sit for a while before scrubbing

fryup

yep, i followed the guidelines to a tee..made no difference