Hi again,
On the painted exterior rendered walls of my house there are some areas that have become coated with a typical very fine layer green stuff, mainly where the wall is damp due to a leaking gutter which will be fixed shortly. The green stuff is extremely thin. What is a cheap, effective, easy way to kill or remove this, prior to painting with exterior emulsion?
Would household bleach work? It seems to work well on interior mildew.
Al