Good advice here.
Also remember that meerschaums are coated with wax to protect them, so while the pipe is warm/hot, that wax is softer, and can also absorb any oils or bits of dirt from your hands. While the pipe is hot be gentle if your handling the meerschaum part, don't squeeze hard, make sure your hands are clean. I also believe you should never use liquid cleaners of any sort in a meerschaum, they will be absorbed into the stone and might ruin its coloring ability.