Washing really decreses the life of the pads from my personal experience.
If they pads are really bad (like after using on a single stage paint or serious oxidation), then I'll spray them with an APC, let dwell, spray out with a stream of water, spin the water out with my buffer, and let dry in the sun.
My normal cleaning is different. I'll put the pad on the buffer and turn it on and run a stiff brush to break up any clumps off the pad. I'll then use my air compressor and start in the middle and blow the pad out. It seriously looks about as good as when I wash the pad. You'll want the pad to be dry though but with this system you won't have to wait for the pad to dry after washing it.