How To Clean Fruits and Vegetables?
HOW TO CLEAN FRUITS AND VEGETABLES?
HOW TO CLEAN PORTOBELLO MUSHROOMS
Portobello mushrooms, like most mushrooms should be cleaned by wiping with a damp paper towel or clean sponge to remove any dirt. It is not recommended to rinse the mushrooms in water because they absorb water and will be too watery during baking.
However, mushrooms contain too much dirt to just gently wipe them clean that dirt is always stuck on there. So rinse them very briefly under water not enough for them to absorb water but enough to loosen the dirt. Then wipe them clean and let them sit on the counter, gill-side down like an open umbrella to let any excess water drip off and dry off.