Follow these helpful hints for marvelous mushrooms.
The best way to clean fresh mushrooms is to wipe them with a clean, barely damp cloth or paper towel. If you must rinse them, do it lightly, then dry them immediately -- and gently -- with paper towels. Never soak fresh mushrooms in water, which will cause them to become soggy.
To store: Prepackaged mushrooms should stay in the package, but loose mushrooms or those in an open package should be stored in a paper bag or in a damp cloth bag in the refrigerator. This allows them to breathe so they stay firm longer. Storing mushrooms in a plastic bag causes them to deteriorate quickly.