What do you use to get moss/algae off paving slabs?

[Fluffycloudland77]

The front of our house gets little sun & the stone window sills are going green!.

[Swannykazoo]

Get a pressure washer! I spent years trying various treatments for green flagstones in a shady garden with intensive yard brushing and rinsing which help a tiny bit. Borrowed a pressure washer before I put that flat up for sale and it was amazing. (Be prepared to get absolutely filthy yourself though) Couldn't believe I'd been wasting my time for so long....

[HarrietSchulenberg]

Yes, pressure washers are great for that. But mine won't reach to the end og the garden so I find Jeyes fluid solution does a good job - tho' it's not very environmentally friendly.

[ushiemama]

Don't bother with products, a Power Washer will do the job. Be prepared to get wet & wellies are a must. Set aside plenty of time,it's addictive cleaning. Don't buy cheap or you'll replace it in a couple of years. A Karcher is superb. Happy blasting.