I live in an older house with a leaky bathtub which drips from the showerhead and/or sprout. The interior of the bathtub/shower walls are 6 x 6 tile. I attempted to replace all three stems which would stop the leak. But the problem is that when I removed the knobs to expose all three stems two of them (hot & cold stems) are covered with either grout or thin set. So I started chipping it away to expose the two stems but this process is long and time consuming. This should have been an easy job but its impossible to remove and replace the stems if I cannot clear away the grout/thin set around the nut of the stems.
Is there a tool or liquid solution I could purchase to remove the grout/thin set more easily without damaging the tile?