Back in the day, we had a coffee machine, so could grab a cup at any time.
Sometimes it would take several to get me through the morning, & of course, it was standard practice to take them back to the bench & continue with what we were doing----"O H & S"? what's that!
One day I was soldering away, & without looking, I poked the iron into what should have been the damp sponge, but the hiss & aroma seemed different, somehow.
I'm here to say that coffee doesn't do a good job of cleaning an iron tip!