I think the instructions say, sour cream remover, I assumed language barrier, for a German glass cleaner chemical?
Anyway you don't need that, cleans fine with hot water, and can use a little iso alcohol too... Keeping it clean is super simple and we've discussed it a few times in here.
And vapor experience comparisons have been mentioned here already, despite some similarities to other vapor signatures, it really is a unique experience!
Also again, I know we're joking, but do NOT touch the heater ball when in use, super easy way to burn your hand real nice! lol