Some of the older slabs at the side of our house are going green even though we washed them over the summer.

Does anyone know of a good pet-friendly, easy to use product that would clean up the slabs and if there is such a thing, would protect them against the green algae building up again?

Thanks.

I'd use no chemicals but a power washer.

agree with the jet spray or power washer. we do ours with this once a year and they clean up really well, with no need for chemicals.

power washer.

Barry

I usually use a power washer but have noticed that an adjacent slabbed area which I have never blasted doesn't have the green build up.

Just wondered if there was anything that i could use to effectively seal them once i have them clean.

Thanks.

The light and sun will affect areas . power washer. If you do it once a month or even every 2 months it should be enough to keep it down.