A portable, lightweight, easy-to-carry, reusable, durable, and environmentally-friendly assembly for sterilizing contaminated equipment using conditions of a chemical sterilant, heat, and humidity generated in situ without requiring external electricity, fuels, or other exogenous energy sources for operation. Each of the plurality of large-capacity through holes and small-capacity through holes extends from a first end face to a second end face. The techniques include enabling the washing machine to automatically run the self-cleaning wash cycle according to schedule, wherein enabling the washing machine to automatically run the self-cleaning wash cycle comprises automatically dispensing an amount of self-cleaning additive from one of the one or more storage tanks into the cycle.