I use dried porcini a lot and after soaking them always run them carefully through my fingers and look them over a bit in order to try to detect (a) any grit that has not come loose as a result of the initial soak and (b) any little worms that are lurking about. Every now and again, I do find some (and remove them or the piece of mushroom).
Of course, soaking and washing can have well-documented deleterious effects on fresh mushrooms but nevertheless, washing or soaking strikes me as an eminently reasonable thing to do in order to get rid of unwelcome hitchhikers, if conditions require such action. I believe I once saw Jacques Pepin say "if thee mushrooms are reallee dirtee, I wash them." I have since then felt free to do as I see fit -- to wash or not to wash (of course, it matters too what one is going to do with the mushrooms), reserving the wash option for when they are 'realee dirtee'. (N.B. I try to reproduce with spelling a touch of his accent out of affection for his manner of speaking, not out of any goober-headed desire to mock the French.)
Many moons ago I used to watch Jeff Smith, the Frugal Gourmet, primarily to see what strange things he would say and do (he had some extraordinarily bizarre takes on history, culinary and otherwise). I could swear (but hesitate to do so because this seems so completely insane) that in one of his shows on Italian food, he sang the praises of imported Argentine porcini, which -- as he rightly observed -- are or were much cheaper than those from Italy. But they are or were (I haven't even seen any for years now) also generally full of grit and other unwelcome accompaniments, something which he did not comment upon. Mr. Smith ultimately took a handful of the things and, as a time-saving and flavour-releasing measure, hurled them, still dry and unexamined, into a spice grinder, ground them up, and then poured the pulverised matter into whatever it was he was making... Mmmm, a nice, gritty mineral supplement but not reliably vegan in nature...
One last thing; I can understand someone choosing for him-/herself to accept the possibility of a few wee wormies making their way into a finished dish in order to avoid any of the effects washing or soaking may have on taste and texture but in a restaurant, it could surely be a disaster if patrons discovered vermicelli where they ought not be. I think I would be a little unhappy with such a discovery and so applaud your sanitary measures, Evil Ronnie.
A
Alle Nerven exzitiert von dem gewürzten Wein -- Anwandlung von Todesahndungen -- Doppeltgänger --
- aus dem Tagebuch E.T.A. Hoffmanns, 6. Januar 1804.
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Na sir is na seachain an cath.