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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.