How to I get rid of white circles of what I think is an algae or lichen on my patio.
Cornwall, United Kingdom
I have cleaned some off but it is a really hard job involving using wire wool and rather too much 'elbow grease'! Has anyone any idea of the best way to clean this? Any recommendations of something I can buy or is 'elbow grease' the best!!
- 30 Jun, 2009
mosses and lichens