Our house, like many houses in the area, suffers from green mould on the sides where it gets no sun. (Ie the north facing side).
I would mind so much but it's the front of the house, so it looks pretty scruffy and therefore has little kerb appeal.
I wondered if there were companies which could wash and scrub it up nicely. I had a go myself but without a decent ladder I can't really make much of a difference!