区别就是两者意思是不一样，具体的不同如下
clear out中文意思是走开；把……清出；办理海关出口手续
It has been suggested that yawning and hiccupping might serve to clear out the fetuses airways.
clean out中文意思是清除，打扫干净
I hope you will clean out all those sticky old sweet papers and empty envelopes from your drawer this time.
I've told you a hundred times to clear out those bottles .
我已十遍八遍叫你把那些瓶子清出去了。
Clearing out the wilderness by the nolachucky river took grit and gumption .
沿诺兰查基河开拓荒野需要的是勇气和本事。
I must clear out the garage, and there's hardly enough room for the car .
我一定要把车库腾空，简直没有空地方放汽车了。
They proceeded at once to extract the interior mould, clearing out the boring of the piece .
他们立时动手掘砂模，掏清炮筒。
Altogether the situation was so unpleasant that slyme determined to clear out .
总之，处境是太不令人愉快了，所以斯莱姆决定一走了事。
Whole ages of abuse and oppression cannot crush the manhood clear out of him .
千百年的虐待与压迫，也不能把他的男子气概消磨得一干二净。
Every time he comes here he tries to goad me into doing or saying something that would give him an excuse to tell me to clear out .
每次他来到这儿总想挑我讲点什么或者干点什么，好给他一个借口赶我滚蛋。
Your teacher came by yesterday and cleared out the account
你的老师昨天来结的
Method before clearing out the collection and raises the
在清除该集合之前调用
这四个短语都有“清理，清洁”的意思以下写出四个短语相近的意思以做对比clear up ：vt.1.(get rid of, tidy away 收拾)清理掉（书/垃圾/碗碟）
clear out：vt.① (tidy) 整理 ?橱柜/抽屉/房间?② (empty) 清空 ?橱柜/抽屉/房间?③ (throw away 扔掉) 清理掉 ?垃圾/旧衣物/玩具?clean out: transitive verb[clean sth out, clean out sth] (cleanse thoroughly 彻底清洗) 把…的内部清扫干净 （烤箱/厕所）? you need to clean out your ears! 你该掏一下耳朵了！