The manufacturer of rotary grille cleaner only uses electrostatic field instead of electronics. The mechanism is that water molecules have polarity (also known as dipoles), when water dipoles pass through the electrostatic field, each water dipole will be in a sequence of positive and negative. If there are dissolved salts in water, the positive and negative ions will be surrounded by water dipoles and arranged in the order of positive and negative in the water dipole group, so they can not move themselves, so they can not be close to the wall of the tube, and then deposited on the wall of the tube to form scale. At the same time, the oxygen released from the water can make the pipe wall produce a very thin oxide layer, which can prevent the corrosion of the pipe wall. Chemical methods use chemicals to cause surface contamination or chemical reactions with the coating to be removed, such as pickling and alkaline washing of the scale layer. In order to prevent the substrate from being corroded in chemical cleaning or to control the corrosion rate within the allowable range, an appropriate amount of corrosion inhibitor and additives with the functions of activation, permeation and wetting should be added to the chemical cleaning solution.