CAB-35 is coconut oil amide betaine, which belongs to a zwitterionic surfactant. Its HLB is relatively low, and the foaming amount after high-speed stirring in water is less because of the defoaming effect of lipophilic groups. AOS is a simple anionic surfactant, similar to SDBS, which has completely hydrophilic sodium ions and strong foaming ability. If it is only used to clean the surface of the workpiece, the latter is cheaper and more affordable. Please refer to it. CAB-35 must consider whether the aqueous solution system contains opposite ions. Although amphoteric surfactant has excellent cleaning power, it is restricted by too many conditions.