When you’re ready to start cooking, keep in mind that mushrooms can’t be washed like a regular veggie.  They are like sponges and soak up water, so they cannot be run under a tap or soaked.  Instead, you can: Clean with a damp cloth to get rid of traces of soil. Rub them delicately with a small brush. You can use a nail brush or toothbrush (new of course) to do this or purchase one of these cute mushroom brushes Scrape debris or discoloration off with a knife