How to clean the refrigerator pipe ah?

Refrigerator pipes have the following two common cleaning methods:

Method 1: Vacuum Pump Cleaning

Cleaning agent into a plastic container, the cleaning agent towards --- (inner machine) into the thin tube ---- into the evaporator --- out of the thick tube --- into the large Coke bottle ---- Coke bottle ----- Coke bottle ----- Connect the vacuum pump, the cleaning agent should not enter the vacuum pump, or you can replace the coke bottle with other transparent glass containers.

Method 2: pump cleaning

Prepare a diaphragm pump, (plastic pump head) corrosion resistance, cleaning agent into the container ---- into the pump ---- into the thin tube ---- into the evaporator ---- out of the thick tube ---- into the container ---- so cycle (pump inlet to be coupled with a filter device) with high pressure nitrogen gas Cleaning, nitrogen is a dry gas, with which the blowing system is both clean and economical, and no ice blocking of the consequences, it is worth choosing.