Years ago I had my bedroom decorated. The stone hearth wasn't covered, and there are numerous splodges of emulsion on it. I took the plaster off the chimney breast, back to the brick and removed newer bricks from where the fireplace opening had been bricked up and plastered over, so the hearth is on show. I've put up with the spilt paint for years. I now want it to look as it should. I live in a Victorian house, and the hearth is the original. I tried hot water and washing up liquid, and also white spirit. I've been advised by an ex decorator Nitromors is the only product which will work. I've used it before to remove gloss paint, but is it the correct product for this job? Many thanks.