Cleaning the mushroom is quite easy process. It has only 2 steps.
What you need?
Dry Paper tissue/Paper Towel
Rub the mushroom with paper towel/tissue. Wipe it until the black dirt goes away.
Remove the stem gently.( Twist and pull it)
Mushrooms are extremely porous. Do not soak it in water, then it will be like a sponge.