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No tried that it took the morter out but nothing else

Hi footprints, no I am quite sure it's not, it was there when I took the top layer off with a scraper, then alot of hard work mainly with stainless steel scourers.

I Cleaned some tyrolean render off some engineering bricks and its left a residue on the brick, I have used brick acid, thinners, turps, wire brushes and nothing moves the residue, has anyone had any experiences like this.