For decades, vapor degreasing was the “go to” precision cleaning technology. This came to an end in the 1990s when the ozone issue forced the phase-out of the most popular vapor degreasing solvents. Water-based cleaning systems filled some of the void. But today users of aqueous cleaners know those systems guzzle electricity, have large footprints, require significant capital investment, are maintenance intensive, and usually require extensive wastewater treatment systems. It’s time to revisit vapor degreasing.