I have a project coming up, and this is part of that project.
They are aware it will return, but it’s got a bunch of build up and they want it cleaned off… It’s a powder like substance, feels like flour.
What can you guys recommend?
Lick it for verification 
, it’s likely Efflorescence
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I was tempted too, but the coustomer was on my neck
I use F9 Efflo……
Efflo works well. Before you start slinging chems and washing, get a wire brush that will screw onto a broom handle and knock as much off as possible with that. Then hit it with chems and agitate with the brush. Then rinse.
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