[Nameless Drudge]

[Nameless Drudge]

Any recommendations to remove this staining? The building is 6 storeys high.The green staining under the balcony`s is likely caused by run off from the decking. I`m guessing  the black staining is some form of oxidisation run off.

[Nameless Drudge]

Anybody think low pressure and heat will shift it or are chemicals probably needed?

[Rob_Mac]

I think you have two separate things going on there.

Off the decking you have an algae build up, which should pressure wash off, it may have marked the surface.

The second issue, I think is a metallic run off, either from bolts or framework, this is harder to remove, pressure wash, it may lighten it, it may remove it completely.

Maybe match up the paint colour and go in with the offer to repaint specific areas, if it doesn't clean off properly!!

Rob