Is there a way to clean/clear mortar off old bathroom tiles?

Question

I had to open up a whole in the bathroom wall to fix a leak and I need to reuse the tiles that I took off. I have no spares and they are at least 25 yo so looking for duplicates would be a waste of time.

Everything I have tried so far falls short so I am asking for idease/approaches.

Thanks

Answer 1

I use a grinder with a dry diamond blade on it to grind the old morter off. A regular metal grinding wheel might work to. It takes a while but it is the safest way to clean them without breaking them.