DH was in the kitchen when I was taking the mushrooms out of their box and chopping them before throwing into the frying pan.
"Aren't you washing them first?" He asked curiously.
"Er, no." I replied.
"What about dirt." And he pointed to a very few little bits of soil that had adhered to a few of the mushrooms.
"Oh, that's clean dirt." I replied.
To be fair, I brush off any bits of soil before chopping, bot don't wash mushrooms. AIBU? 
I don't really care tbh, life's too short to wash a mushroom, and neither me, DH have been ill with food poisoning (DH once many years ago or it could have been a virus).