I do a very warm water & Dawn dish washing soap. I dip the filter down into the water in a swooping motion so the water enters the back side of the filter, back flow direction. First dip lots of crud flows out. Then I leave it with the CVT side up for about 10 minuets and swoop it a few more times. The rinse twice in the back flow direction.Compressed air is one way to clean the 650 filter but there are other ways. I take mine into the kitchen and wash it with warm water and dawn dish washing soap. Air dry in front of a fan and reinstall.