I have a ton of trees and a lot of tiny stem-like debris that really sticks to the bag. I am running the Dolphin pretty much every other day because of the leaves and other debris. Just hosing the bag doesn't work for me. I have been letting it dry as I said and shaking it. I swish it in a bucket of water with a dash of laundry detergent and it comes out clean as a whistle.
It does say to clean it as soon as it is removed from the pool, but so far I have not had a problem. I think I may invest in the filter bag made for rough debris though.