Yes, the wonderful feeling when you draw pretty hard on a note and something pings off the back of your throat and goes down your windpipe!
The best way is to take them apart and clean them out properly. It's easier now they have nuts and bolts instead of those rotten little nails that Hohner used to use. If you don't want to take them apart, you can pluck some of the gunk (alright dried spit!) that congregates at the front of the hole with a pin (just like eating a winkle!). Don't eat it though!
We do suffer for our art, don't we? Especially if we have facial hair.