1.真空吸污：用类似有手握式的真空吸污管来操作。用刷子直接接触螺旋风管管道内壁以清除污物。这种方法需要风管有较大的检修孔使操作的人员能够尽可能够得到但这种方法最可能漏掉一局部尘土和污物，因为风管不能形成完全的负压条件。而以下几种方法可以形成负压条件。

1. vacuum suction: operated by a vacuum suction pipe similar to a handheld type. Use brushes to directly contact the inner wall of the spiral duct to remove dirt. This method requires a large overhaul hole in the wind pipe to make the operating personnel available, but this method is most likely to leak out a part of the dust and dirt, because the wind pipe can not form a complete negative pressure condition. The following methods can form negative pressure conditions.

2.动力洗刷：用气动或者电动的毛刷将脏污刷动，然后污物用和气体冲洗相同的方法和方向被吸到真空收集器中。这种方法要求尽可能的小心不至于破坏保温资料的外表。

2. Power scrubbing: brush dirt with a pneumatic or electric brush, and then the dirt is sucked into the vacuum collector in the same way and direction as the gas scrubbing. This method requires caution as far as possible, so as not to damage the appearance of thermal insulation materials.

3.气体冲洗：这种方法借助连接到螺旋风管的配有喷嘴的软管以输送压缩空气。设计喷嘴使得压缩空气能够把尘土和污物驱赶进来。而被压缩空气去干的污物和尘土则顺着风管被输送到真空集容器中。

3. gas flushing: this method uses a hose equipped with a nozzle connected to the spiral air duct to transport compressed air. The design of the nozzles allows compressed air to drive dust and dirt into it. The dirt and dust dried by compressed air are transported to the vacuum collection container along the duct.