Been there, done that. It's not as bad as people make it out to be as long as you can get the fact that your tongue is sliding up something that yesterday's lunch, along with a mix of other ingredients, was the last thing to occupy the tunnel.
Only if it's clean.
That's my two cents.
Maybe tonight we'll fly so far away... We'll be lost before the dawn...
By clean do you mean clean on the outside, or clean on the inside? Either way, it wouldn't hurt to shove a hosepipe up there for a few minutes, just to get rid of anything that's hanging around, no?