I'm having rouble with algae appearing on all external walls around my house. Last yr I had a similar problem so hired a power washer and got rid of the lot. However, since the new yr its returning worse than ever. I have algae on all external walls, front, back, garage and house and was looking for help in how best to clean it and ensuring that its not something that comes back again next yr.
I was thinking that trimming the evergreen trees to the side of the house would be the first thing to do, then spray the walls with bleach, leave for a week or so, then powerwash the lot before painting with external wall paint.
I suppose I need to get some experiences or knowledge of others who have dealt with this issue and is the approach above (however timely) worth all the effort or will it be back again next yr.
Also, is there a particular paint I should be looking to use ?
All help appreciated. Thanks.