How often do you clean it and what is your process?
Well, when I am on track of things I clean the sponge during every water change (I have cut back to one water change every month, rather than two weeks).
Tools:
Two 1.5G buckets (size doesn't really matter, but these are the buckets I use for water changes)
Plastic cup
Steps:
1. Use the plastic cup to pour a bit of old tank water into a bucket.
2. Take out the filter sponge and place it in bucket with the old tank water.
(its important that you take out the sponge before the water change)
3. In the second bucket take out of the amount of water you want change for your water change.
4. Rise the sponge with the old water that is in the second bucket.
5. Place the sponge back in the filter.
6. Replace old water taken from the tank and add your new water to the tank.
Hope that helps. I am sure others do it differently.