Before pressure washers became standard cleaning equipment in commercial kitchens and food processing units, hygiene was a major issue. The dining areas would be spotless and gleaming, but the kitchens were often messy and unclean. Thick layers of grease, with an added layer of dust or hydrocarbon deposits, and the endless hard work of trying to scrape off the dirt summed up what happened in the kitchens after hours.
Thankfully, more advanced...
