funguy, you have missed opportunites to observe many different machines in action if you have not ever been to a coin-op laundry. It's probably not as exciting now, but a coin laundry was where I first watched a Kelvinator go through its paces. In the summer of 1958, there was a very large coin laundry at a giant grocery store called the Little Farmers' Market in Miami that had Frigidaire washers, all with solid lids except for one with the round window in the lid. It also had an air conditioned waiting room with a television, but the real show was out there in the heat and humidity. In coin laundries I was able to use Bendix, Philco-Bendix, Westinghouse, Troy Big Boy and Milnor tumbler washers and Speed Queen, GE, Hotpoint, Westinghouse, Norge, WP, Maytag, Frigidaire & Blackstone top loaders and perhaps the rarest commercial washer, the WP Wash A Lot which was based on the 33 inch WP combo,(on steroids) that handled large loads and used the same Filter Stream wash system. I have no idea what they had to do to that machine to make it extract better than the combo, but it had to have a rear frame of super heavy steel, probably a stronger tub with a much larger tub shaft and bearing. It was securely anchored in cement. Any of those large tumbler washers breaking loose from their anchors during spin would be like the Steven King story The Mangler, which is a very good and very frightening story that at least begins in a laundry.
Jamie, I have washed OLD grease stained and worse shop towels in the Mieles and even in the Creda on the extended highest temp wash with a good HE detergent and STPP. The results were as dramatic as yours, althouth I did not use the soak and started with a hot water fill since everything had old stains, not of the protein type. Only the rust stains needed special treatment. The type of results at the Y laundry are what so many people settle for today having been told that sorting is not necessary when washing in cold water. And, there is some truth to that. Once everything turns a beige/gray taupe color there is no need to sort by color and fabric type never was given consideration in the first place. Tom