I used to carefully clean my mushrooms with a brush to keep them dry so they wouldn’t end up slimy. But someone told me that was a myth and I decided to try just quickly rinsing them instead. Never resulted in slimy mushrooms, and I was shocked at how much crap ended up in the rinse water.
Parboiling is often a critical step for certain mushroom species to remove toxins. But that's probably only relevant if you're foraging outside your local grocer.
