Discoloration on brick from shutters

[marinegrunt]

I can’t help you but there was a recent thread about some hard to clean brick. I don’t know if it’ll help you or not but here it is.

Brick job from hell

I wanted to update this thread for anyone who might find it in the future. Before I left the job I sprayed straight 12.5% on these lichen stains. I came back two days later and they are now gone. Thanks for all of the advice. Good day [image]