You need to clean your pads better..
Snappy Clean in the envelopes has been working great in the Shop for years.
1 envelope or 1/2 envelope in about 3 gallons of water, soak the pads, knead the pads in the solution, rub the foam side against the other side, soak, knead, remove, rinse in the sink in warm water, squeeze dry and let dry somewhere on an end, and I never have anything in the pads including soap, etc., to hurt what I am doing...
Product cleans everything out of the pads.
Product very low foaming, so less of that to deal with..
Product smells great..
Product comes in envelopes, so no gallons of this or that to carry around and deal with..
Been doing this same process for years, works great..
Good luck with your research -
DanF