for MF pads, I use a plastic wash board in the sink after blowing them out and brushing them a bit with a stiff pad brush. Just be careful not to drive the edge of the pad into the washboard, I have peeled the MF off the foam base in the past. after a brushing and blowing off, there is not a lot left in them to clean out, 3 sprays with GG pad cleaner and scrub for about 30 seconds each half.
I have the grit guard pad washer, and for foam pads there is nothing quicker for me.
Use the LC pad cleaner powder in the water, give the pad 2 sprays of the GG pad & MF cleaner, mount on the rotary @ 1500 RPM, and the pad is clean in ~ 2 min. I still use mine to this day, foam pads have never been cleaner, quicker.