Well, you never know…might score some extra crumbs that way…(good at finding food)
We sometimes offer both our dog and cat food containers, plates, or flatware to let them lick the residue off before we wash them. It always amazes me how exhaustive and meticulous a job both of them do of it, licking until long after every last bead of moisture and every pinprick-sized speck of food is gone. Yes, I’ve been known to lick such items on occasion too, but never that thoroughly–my taste buds stop being happy once the licks start tasting more of plastic, stainless steel, or tempered glass than of food. I know I have many more taste buds than they do though, so I guess my experience of it is just different.