Since when does water "lather"? Spit has enzymes, so why not letting them sit so they eat the leather to the flesh side? I said Renomat can work like a soap, but I never called it a true soap.
If you want, go ahead and poke your shoes till they penetrate your toes and walk that bloody feet home just for fun. Waxes shouldn't even be caked on in the first place.
It can lather and bubble up as good as petroleum distillate. Not sure if your spit is that poisonous. By your logic water can work like a soap as well, it cleans shit!
From the sound of it you are probably not that familiar with hand tools. Or maybe you are capable of punching a hole through your heat-form plastic toe stiffener using a paper clip.