1 IntroductionrnCleaning is an essential step in the processing of reusable devices,which ranges from noncritical devices that only touch the skin to critical devices that contact with sterile areas of the body [1] All the reusable devices must be clean to ensure surfaces of devices are freedom from harmful residues and compliance with various regulatory requirements.The residues,especially bacteria,can readily adhere to wet surfaces and form organized colonies of cells termed biofilms,which are enclosed in a self-excreted matrix composed extracellularpolymeric substance (EPS) [2].