Why must instruments be cleaned before being sterilized?

Cleaning is the removal of foreign material (e.g., soil, and organic material) from objects and is normally accomplished using water with detergents or enzymatic products. The first step in preparing an instrument for reuse after it has been used on a patient is cleaning. The importance of this step cannot be underestimated, as studies [Alfa, 1998] have shown that a soiled instrument cannot be effectively sterilized. Also, if soiled materials dry or bake onto the instruments, the removal process becomes more difficult and the disinfection or sterilization process less effective or ineffective. 

Cleaning is done manually in use areas without mechanical units (e.g., ultrasonic cleaners or washer-disinfectors) or for fragile or difficult-to-clean instruments. The most common types of mechanical or automatic cleaners are ultrasonic cleaners, washer-decontaminators, washer-disinfectors, and washer-sterilizers. Ultrasonic cleaning removes soil by cavitation and implosion in which waves of acoustic energy are propagated in aqueous solutions to disrupt the bonds that hold particulate matter to surfaces. 

Roshan Rai Sepahan Company has designed and presented various types of Cleaning indicators, including Sono Check RRS.

Content source:

Centers for Disease Control and Prevention

Please Check out the file at the following link

Sono Check (Indicator of Monitoring the Washing Process) (RRS14-82110)

Packaging instruments for the sterilization process

How often should biological indicator be used on the sterilization process?

Documentation NoteBook RRS (CSSD)