Cleanse me with hyssop, and I will be clean; wash me, and I will be whiter than snow. (NIV)
Purify me with hyssop, and I shall be clean [ceremonially]; wash me, and I shall [in reality] be whiter than snow. (AMP)
Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow. (KJV)