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 dinner
温馨提示：答案为网友推荐，仅供参考