'Soap' in the Bible

If I have washed myself with snow-water, And purified with soap my hands,

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

For though thou wash thee with nitre, and take thee much soap, yet thine iniquity is marked before me, saith the Lord GOD.

But who may abide the day of his coming? and who shall stand when he appeareth? for he is like a refiner's fire, and like fullers' soap: