I'm not suggesting that the parts be cleaned with anything other than the Zep. I was pointing out that McNaab requiring his employees to use the Zep to clean machinery is akin to criminality because of the fumes and the flammibility. Especially since there are safer and cheaper products to use.
They don't clean
machinery with the Zep, they clean
small parts.
Furthermore, you are assusming that ACS is not using the proper parts-washing enclosures, containers, ventilation, etc. - a fact not in evidence.
One again, the EPA complaint has absolutely nothing to do with endangering mere human beings - only the soil out back, and a nearby stream via osmosis.