Wouldn't it be nice to save some money on soap? I have tried different soaps to use in the foam soap dispenser I have at home. Dish soap does not work. Soaps are too thick or thin.
I have found that body wash works best to make foam soap. I like St Ives. Experiment with the ratio of soap to water because different body washes need different mixes. I suggest adding some water first so heavy soap does not lodge in the uptake tube.