I have to paint the outside walls of a house once the weather improves. It's been painted before and the walls are some sort of rough texture. The walls are in reasonable condition but the north-facing wall is covered in some sort of reddish algae or lichen. What I'm wondering is how to go about cleaning this off prior to painting.
The same stuff grows on the patio below and this can be pressure-washed off. This isn't really feasible for the wall though as it's huge, probably 30 feet high, and the algae is growing most of the way up.
Is there something I can put on to clean/kill it before painting. Also, what brands of masonry paint are recommended. It's on the west coast of Scotland and gets a bit of a battering.
The same stuff grows on the patio below and this can be pressure-washed off. This isn't really feasible for the wall though as it's huge, probably 30 feet high, and the algae is growing most of the way up.
Is there something I can put on to clean/kill it before painting. Also, what brands of masonry paint are recommended. It's on the west coast of Scotland and gets a bit of a battering.