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dbr

Brick acid would probably take that off. Grout and pointing is alkaline so acid will work on it. White vinegar works too, probably a bit less gnar.

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NotThamesWater in reply to @dbr

Wouldn't the acid react with the limestone first though?

Obvs depending on what the grout is, but unless it's lime based, I'd think it was less reactive.

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hugo7 in reply to @NotThamesWater

Wouldn't the acid react with the limestone first though?

Yes

Obvs depending on what the grout is

EazyJoint - a sort of self reacting resin grout. Idk if there's alkine in it. It comes off fairly easily.

The stains I need removing are the splashing of the slurry bed the slabs are layed on.

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