'Soap' in the Bible

If I am washed with snow water, and make my hands clean with soap;

And my hand will again be on you, washing away what is unclean as with soap, and taking away all your false metal;

For even if you are washed with soda and take much soap, still your evil-doing is marked before me, says the Lord God.

But by whom may the day of his coming be faced? and who may keep his place when he is seen? for he is like the metal-tester's fire and the cleaner's soap.