Well when we bought a new washing machine, there was really nothing wrong with our old one, it just was a cheapie that came with the house so it didn't have any settings other than "off" and "destroy all clothing placed inside." I shoved it over to the side, bought some Y fittings for the water and drain hose and now I have my very own shop rag washing machine! ::
Washing them at home depends on whether or not you have a septic system or you are on a city sanitary sewer. I throw my greasy towels away as I don't want the grease in my septic. If I need more I go to the Goodwill and buy some used bed sheets for pennies and cut them up.