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.
JUST WIPE IT OFF WITH A DAMP CLOTH YOU FUCKING HEATHENS ITS NOT THAT HARD
Edit for context: I am a barista. All you have to do is have a damp cloth on hand when you finish steaming the milk to wipe down the wand. Takes maybe 30sec total, including finding and dampening the cloth before you start.