Cleaning Mushrooms: While I was working at Guy Savoy in Paris, I learned to wipe each mushroom clean with a damp cloth. Mushrooms are sponges and submerging them in water, especially for a longer period of time, dilutes their flavor. For white mushrooms, I trim the very bottom of the stem (it's often coated in soil) and wipe the whole thing clean. If they are especially dirty? Rinse them briefly in cold water and then cut and cook them immediately after.