Abstract: An apparatus and process are provided for non-combustion, high-temperature cleaning of organic contaminants from fragile parts which are resistant to heat below the temperature of combustion but which may not be resistant to burning or heat above the temperature of combustion, by pyrolysis in a self-inerting atmosphere not supporting combustion, and by oxidization at a controlled temperature below the temperature of combustion for the contaminants preventing fires, explosions, and difficult-to-control temperature variations, with means for removing smoke and fumes from effluent gases, and equivalently for cleaning non-fragile, heat resistant parts as well.