I've been using a drop or 2 of lemon juice, let it sit, then rinse with very hot water for a few minutes, blow out and air dry. For the super gunk I've been soaking in apple cider vineagar for 10 minutes then rinsing them out and air drying the same way. I'm a little scared to dry burn! perhaps in a desparate moment I will gather the courage.
That's really a good idea, i'm going to have to try the vinegar trick it's cheaper than everclear. There's no aftertaste hanging around afterward?