Afternoon all,
Quote on a window cleaning job today and the client also has some stone columns & horizontal pillars in the attached photos with some black marks. Didn't have my gear on me so couldn't try to remove them with water and a scrub on the spot, anyone had experience with this sort of thing? I guess it looks a little like lichen but I'm hoping it doesn't need to be pressure washed off — what chemicals would you reccomend? Hypo? Virosol? TFR? Thanks in advance!
Quote on a window cleaning job today and the client also has some stone columns & horizontal pillars in the attached photos with some black marks. Didn't have my gear on me so couldn't try to remove them with water and a scrub on the spot, anyone had experience with this sort of thing? I guess it looks a little like lichen but I'm hoping it doesn't need to be pressure washed off — what chemicals would you reccomend? Hypo? Virosol? TFR? Thanks in advance!