Husband’s Greasy Laundry

My husband works 12 hour shifts frying potatoes in a factory. His laundry not only STINKS like old oil, it is also greasy and sometimes batter-splattered. I’ve been giving them a double wash in hot water, using Arm and Hammer detergent, Dawn dish soap, Febreze Laundry, and rinsing with vinegar. It helps, but we’re still going to have to toss his clothes soon (not to mention the Febreze is $$). They still stink – though not as bad, and though not as greasy, it tends to build up. Any suggestions would be greatly appreciated.