Bathroom problems.. Have a 40 year old house. The shower stall has 4 1/4 by 1 3/4 inch tile and we have problems with water stain, mold and discoloration on floor ( from feet where we stand) . Have tried various off – shelf clearing products, but they do not work very well. Have been told that muriatic acid wash will do the clean up job. On reading the instructions for the product, am a bit concerned about using it.
Questions; (1) What will this stuff do to metal ? Should it be masked off?
(2) Can I get a more or less permanent fix ? ( Have recently fixed and up graded the fan , but mold keeps coming back)
Any other suggestions appreciated. Thanks