While many recommend brushing off dirt with a damp paper towel or pastry brush to avoid "waterlogging," testing shows that a quick rinse only increases mushroom weight by about 2%.
Rinse quickly under cold running water just before cooking, then spin them dry in a salad spinner or pat them thoroughly with a towel. MUSHROOMS
Remove mushrooms from plastic wrapping immediately. Store them unwashed in an open paper bag in the refrigerator; the paper absorbs excess moisture and prevents them from becoming slimy. While many recommend brushing off dirt with a
Get a heavy stainless-steel sauté pan very, very hot—it almost can't be too hot. Add a generous film of oil (mushrooms soak it up) ruhlman.com 5 Common Mushroom Cooking Mistakes, and How to Avoid Them Store them unwashed in an open paper bag
To avoid "rubbery" or "soggy" mushrooms, use methods that drive off moisture before browning begins. How To Cook Mushrooms - Michael Ruhlman