This client has a heavy buildup of what appears to be mineral deposits on the shower marble floor & glass tile walls that she would like removed. The shower is less than 5 years old and is in the city on city water. I tested the floor tile with an acid cleaner, got some fizzing, but mostly ineffective. Any suggestions on other products to help remove? Thought about honing the floor with diamonds, but unsure about what to do on walls. Thanks for any advice.