Cleaning garden floor

[Gardenertobe]

So I have concrete slabs in my back garden which continuously looks terrible. Black, dirty, covered in weeds, moss in certain places. I have been recommended farmer's bleach but I really don't want to go down such a destructive route for the environment. Happy to just pull the weeds out constantly but nothing seems to work that well on the dirt. I have the Bosch pressure washer but it leaves marks everywhere and doesn't clean that well.

I'm a total newbie to this type of flooring - would anyone be able to recommend me a cleaner, methods etc.?

I use a product called patio magic. It works really well, you dilute it, treat the area then rinse it off. It isn’t bleach based either. You could brush some fine stones into the gaps of the paving stones to help with the weeds. Good luck.

Patio magic works on growing stuff so mould, algae, moss

Pressure washer for dirt

Best option is pressure washer followed by patio magic