When the Dolphin Dynamic runs it's fantastic.

Unfortunately, mine went to the shop yesterday after only 2 years. I hope it's not TOO expensive to fix.

Cleaning the bag:
1) If it's REALLY full, I turn it inside out so what can fall out falls out.
2) then, inside out, I dunk it in a 5 gal bucket of pool water, swish it, squish it, and try to get the gunk out that accumulates in the corners of the bag when it's right-side out.
3) Dump the bucket, refill, and do it again.
4) When it's pretty clean, I either let it dry until I have a couple of bags for the washing machine, or it immediately goes in the washer.

To my mind, the idea is to get enough dirt out so it can go safely in the washing machine without clogging the Maytag.

It's not hard and a LOT easier than turning the bag inside out and trying to wash it with a hose.