Thanks for the feedback CX and tool guy, we did a test by scraping off some caulk at the joint of the floor tile to pan to test the surface at a non conspicuous area and found it non reactive to out of the bottle muriatic acid so we used a diluted solution and it came off almost immediately with no damage to the pan whatsoever. Clients are super happy with the job and the checks deposited
Thanks again for the replys,
Richard,
R&G Home Services