I don't know John G's recommendations for dirty pads, but my procedure was- as soon as a given pad was dirty, I put it in a 5 gallon bucket with detergent in it, and let soak, not to dry out, then before laundering, I poured the 5 gallon bucket with the pads in it into the laundry sink, let the dirty water run out, put the plug in, and filled the sink with hot water, let soak for some 10 minute to a couple hours while I did something else, then laundered with BOK's Regular Laundry Powder with Oxy Bleach.
That was more effective than just laundering them, and I think extended their usefulness considerably.
Then when clean, no dryer, I hung them on a line to dry. I think the dryer shortens their life some.
Gary