'Clean' in the Bible

If I wash myself with snow water, And make my hands never so clean;

For thou sayest, My doctrine is pure, And I am clean in thine eyes.

Who can bring a clean thing out of an unclean? not one.

What is man, that he should be clean? And he that is born of a woman, that he should be righteous?

Behold, he putteth no trust in his holy ones; Yea, the heavens are not clean in his sight:

Yet shall the righteous hold on his way, And he that hath clean hands shall wax stronger and stronger.

How then can man be just with God? Or how can he be clean that is born of a woman?

I am clean, without transgression; I am innocent, neither is there iniquity in me: