Black spots on paving slabs

[Twinkle19]

Does anyone know how to get black spots off paving slabs? It must be a type of mould. Ive tried bleach a couple of times but it doesn't shift it. Anyone used anything else thats worked at all?

Patio Clear. It’s expensive but It eats mould. You mix it with water in a watering can, and water the patio generously. BUT You have to wait 3 months to do it’s stuff. It does work if you have the patience.

Oh I havent got any patience at all lol.

Pressure washer? It got the black spots off my patio!

We have tried the pressure washer it didnt get it all up. Gonna see in amazon sell anything to clean it

Milton or bleach and a yard brush

I think it’s a lichen rather than a mould

Is it will look that up thanks might tell me what to use to get rid of it.

https://www.hygienesuppliesdirect.com/pro-kleen-ultimate-black-spot-destroyer-lichen-remover-5l?quantity=1&variant=264589&gclid=Cj0KCQjwz7uRBhDRARIsAFqjulk2pL5fpQfQmI7c4NzcC5BSQa9ZPBbxlMseONTEg5U9G9s0uxuK-4aAqYcEALww_wcB

Sounds like it is Litchen

Ours has spots , if I am really diligent with the pressure washer I can shift them but it is tedious work.

I did try Wet and Forget a few years ago , it did Diddly Squat and it's ££ to boot .