The heat transfer plate material of the plate heat exchanger is generally austenitic stainless steel such as AISI 304, 304L, AISI 316, 316L, 316T, and the stainless steel material needs to be cleaned with a nitrate-based cleaning agent. The heat exchanger gasket material is generally NBR , butyl rubber (RCB) and ethylene propylene rubber (EPDM). These materials are resistant to corrosion by acids, alkalis, ketones, alcohols. Based on this, we use the special cleaning agent for stainless steel products mainly including nitric acid, glycolic acid, corrosion inhibitor, penetrant, and elimination. It is composed of a chemical agent such as a foaming agent. The cleaning agent has the characteristics of high descaling rate, small corrosion rate and fast descaling speed of the stainless steel product, and the optimal cleaning concentration is in the range of 0·10~0·15 mol/L. The performance indicators of the cleaning agent are in compliance with HG/T 2387-2007 <<Quality Standard for Chemical Cleaning of Industrial Equipment>>.