I just had one of those Eureka moments right now when trying to clean my Hydratube. Every night I soak it in Simply Green but sometimes the dirtiest parts don't get clean because of air bubbles. I finally got a glass vase so I could see where the air bubbles were getting trapped. I had the hardest time getting them out but if I put the Hydracirc in upside down and turn the container over with it in, wait a few seconds, then turn back over it gets rid of nearly every bubble and the tiny bit left is in a spot the rezblock liquid sits in so it is clean anyways. That was Eureka moment 1.
Eureka moment 2 came when I realized that my 2lb plastic protein tub is just a tad taller than my hydracirc and it has a screw on lid. If I fill that to the top with my SG solution, or PBW, and put in the hydracirc upside down and then flip the tub over, wait, then flip back it soaks all the worse parts.