You are reading a single comment by @user69121 and its replies.
Click here to read the full conversation.
-
https://www.everbuild.co.uk/product/sika-mould-buster/
A pump up garden sprayer of a suitable size for your path and spray on 2 to 3 times a year.
user69121
Ok, have been considering getting a pressure washer.
I now remember that I did scrub and bleech it at one point which made it better but probably needs doing every couple of months.