Some months ago, some kids had a great fun throwing eggs at the houses around here. I was one of the recipients of this, an egg hitting the front of my house. We'd only recently had the house re-rendered, costing some �5,000, and now the stain left behind has just about ruined it. I have tried spraying detergent on it, and pressure washing it, but the stain returns after a few days, and it looks like black paint! Any suggestions would be appreciated, thanks.
I would use vinegar, I'd soak a cloth in pure vinegar and rest it over the stain for five mins and then wash down with water. Repeat a few times if the egg was 'baked on ' in the sunshine.