clean up 收拾干净,扫除清洗 强调动作的结果就是打扫干净
We spent all Saturday morning cleaning up
clean off 除去,清除 强调打扫动作的本身
He used a tissue to clean his fingerprints off the gun.
clean away 把...清除掉,清除,强调动作的结果是消失或者距离上的消失
Please clear your books away so that I can serve dinne