Yeah the 'dirt' is now in the wort and in your gut....
I hose mine off and hang dry, on occasion I'll hit it with a SS scrubby to break through the beer stone build up. Every year I give it a 20 minute soak in Star San or vinegar. I've used the same IC for 6 years and no issue yet.
I brew the best beer around..ship me your finest, I'll email a picture of me tasting your beer.
Fermenter: Imp Vanilla Porter, BackAtIt IPA
OnDeck: Happy New Beer