草酸：为了省事，很多保洁人员会使用草酸来清洁，可草酸对不锈钢制品有很强的损坏，会使不锈钢制品失去光泽，很难恢复。

Oxalic acid: in order to save trouble, many cleaning personnel will use oxalic acid to clean, oxalic acid has a strong damage to stainless steel products, will make stainless steel products luster, it is difficult to recover.

铁丝球：陶瓷釉面很容易被铁丝球损伤，同样无法恢复。

Wire ball: the ceramic glaze is easily damaged by the wire ball and can not be recovered.

玻璃擦：很多保洁人员使用的玻璃擦很脏，上面甚至还有很多硬物，结果给你擦玻璃的时候就很可能把玻璃擦出划痕来。

Glass wipe: many cleaning personnel use glass to wipe dirty, and there are still many hard objects on them. As a result, it will be possible to wipe out the scratches when you wipe the glass.

地漏：保洁人员打扫的时候往往不想我们自己这么细心，地面可能用水直接冲洗，但有时候刚刚装修完的地面有很多残渣，甚至水泥灰，直接冲到地漏里面很容易把地漏堵住。

Floor drain: cleaners often don't want to be so careful when they clean up. They may use water to rinse directly, but sometimes there are many residues in the ground just after finishing, and even cement ash directly rushes to the floor drain, so it is easy to block the floor drain.