I was looking at a job today that consists of a large vertical concrete building that is grey and has a 2 foot dark blue stripe painted around it 10' up. It appears that oxidation may have caused the grey color to streak down over the blue stripe. I tried using a surfacant with a bleach mixture...
What is the best way and chemical(s) for cleaning bird droppings off of painetd metal siding? I'm looking at using hypochlorate w/ a hot water cleaning. Any input?
Mike Brown