Any ideas?
I've been asked to look at cleaning a number of walls with a red staining (see pics), the surface is rendered (K-Rend I'm told) and looks like the stain is bleeding through from below the surface.
Any ideas :
A) what it might be ? (salts/rust/pollution/weird algae??? ;-)
B) suggested approach to clean off?
I know K-rend is tricky to clean but any of you guys seen or treated this before?
I've not visited the site, as it's a distance away but can get any questions answered which might help?
Would like to do the job so any help appreciated!!
View attachment 3616
View attachment 3617
I've been asked to look at cleaning a number of walls with a red staining (see pics), the surface is rendered (K-Rend I'm told) and looks like the stain is bleeding through from below the surface.
Any ideas :
A) what it might be ? (salts/rust/pollution/weird algae??? ;-)
B) suggested approach to clean off?
I know K-rend is tricky to clean but any of you guys seen or treated this before?
I've not visited the site, as it's a distance away but can get any questions answered which might help?
Would like to do the job so any help appreciated!!
View attachment 3616
View attachment 3617