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For anyone wondering I have used LTP Forrex diluted 1/3 and it has lifted the stains within 2 hrs

Thankyou, appreciate the comments, but yes in person it looks very yellow have ordered some LTP non caustic rust remover for stone, apparently works well so fingers crossed

I recently laid kandla grey Indian stone in my front garden and used acid based cleaner in the edging stones for the excess mortar, I was instructed by the staff at the building place that it was the right stuff to use as I had read that acid base may not be suitable but they assured me it would...