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If one cannot figure out how to open said container, cleaning is still possible.
Bottle brush, paper towel/bent coat hanger, pea gravel, etc.
How do you suppose people reused bottles, jugs, or amphorae?
They WASHED them! A task as old as containers!

palerider wrote: ↑

Fri Aug 26, 2016 2:42 pm

so, in other words, the reservoir can't be opened, to get at all the nooks and crannies, or to drain it completely... which is what I'd heard from others.

Correct. The top is mostly open, but there is about an inch, maybe less, all around the top so even turned upside down a corner or two will collect a few drops of water.