Interesting approach to cleaning them.
I have multiple per tank, so originally I was trying to pick one per tank to clean while doing water changes, but found it rather in convenient. Recently I bought a bunch of replacement Hydro V sponges and am now rotating in 1 clean sponge per tank, tossing the dirty ones in a bucket, and rising them out similar to Marty. It's much easier to just wash them out under a tap instead of using tank water in a bucket, constantly tossing dirty water and refilling with clean 2-3 times per sponge.