FESS Fesshole HOLE @fesshole
We had a cappuccino machine, I thought my wife kept cleaning the crispy dried milk off the steamer spout, she thought I was doing it. A year later, after coffee every morning, we found out the cat was licking it off when we were at work.
The logical inverse, if wiping it off does nothing like you say, would to be then rub a cat turd on the nozzle and it should be fine, since it’s not like wiping it off helps.