until you meet the problem of the caustic soda eating through the metal bucket you have just used because it was the wrong metal - or the plastic bucket turns out not to be heat proof.
Also (and ironically this is what my uncompleted PhD was in, surfactants), soap and caustic soda are incredibly harmful to the skin. Surfactants undergo massive dilution and cleaning commerically to make them even vaguely friendly to skin, as I am sure you are aware.