When I worked at a machine shop in NJ 3 decades ago we had a choice....pay all sorts of fees to use the caustic cleaners in our hot tank, would have been 8k a year just in fees, no chemicals, or use a earth friendly soap of some sorts. The temp. of the machine was turned way up. Did an ok job...but anything really grimey we sent to Star Crankshaft in PA...guess that PA was not as strict as Jersey was at the time.
When it came to disposal of the soap...we hooked a garden hose up to the cleaner and just ran it down the drain....this was the EPA approved method...go finger...
