This document provides step-by-step instructions for properly cleaning a fire fighter's facepiece mask. It outlines 19 specific steps for disassembling, cleaning, sanitizing, rinsing, drying, and reassembling all components of the mask. This includes removing parts like the air klic, nozzle cover, and exhalation valve assembly. It emphasizes thoroughly cleaning folds and crevices, sanitizing the nosecup, and testing the reassembled mask for leaks before use. Following these cleaning instructions helps ensure masks are functioning properly to deliver breathable air during fires.