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You could work your way through a few solvents to test - white spirit, acetone, (toluene, but that would probably leave a lot of trace).
There's brick cleaner, which is often just concentrated sulphuric acid. If that doesn't work, go the other way with sodium hydroxide.
With appropriate PPE, of course.
NotThamesWater
@TGR
Any ideas how I could clean this brick work. I think it was caused by a tiler and the residue is likely tile adhesive. It’s been there over a year and I have tried power hose and brick cleaner with no appreciable change.
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