I do the exact same except I swallow the suds. They taste so freaking good go to me!! I literally do it into my mouth hurts and burns.
Lever 2000, coast and Irish spring are my fav pica treats. I like shave bits of the soap w/my teeth, let it melt in mouth and swallow it. Another way I like it to let the soap dry out for a week so it can get a crunch.