1.clean用作形容词时，意为“干净的，清洁的”，指没有灰尘或刚清扫过。
The room is clean and tidy. 这房间又干净又整洁。
They always keep the classroom clean. 他们总是使教室保持清洁。
2. clean用作动词时，指用各种方式“打扫”干净。
Mother cleaned the house for New Year's Day. 母亲把房子打扫干净过新年。
Can you clean the coat of these dirt marks？你能把大衣上的这些污迹洗掉吗？
3.clear用作形容词时，意为“（天气）晴朗的，（言语）清楚的，（图像）清晰的”。
That was a fine clear day. 那是一个晴朗的日子。
You haven't made yourself clear. 你还没有把话讲清楚。
The photo is not clear enough. 这幅照片不够清晰。
比较
The water is clean. 这水是干净的。
The water is clear. 这水是清澈的。
4.clear用作动词时，表示“清除，澄清，使清澈；放晴”。
The rubbish must be cleared away. 这堆垃圾必须清除。
They were busy clearing the pavement of snow. 他们正忙着清除人行道上的积雪。
It is clearing gradually. 天在逐渐放晴。
5.sweep指用扫帚扫除尘土或脏东西等。
He swept the dirt into a dustpan. 他把垃圾扫进畚箕。
He went into the yard to sweep up dead leaves. 他到院子里扫除枯叶。
6.wipe指用手、抹布、纸等擦拭。
She wiped glasses with a dry towel. 她用一条干毛巾擦玻璃杯。
He sat down to wipe the sweat off the face. 他坐下来，擦掉脸上的汗珠。