What are you cleaning?!I was going to say. No way I’d put greasy and oily rags in my personal washing machine. At best it will leave residue. At worst, it will leave carcinogenic residues in your underpants that contact your skin for hours at a time.
Disposable rags are the way to go for the biggest messes. Maybe there’s a good way to bucket wash or pre-wash rags. I’d love to save $$ too over consuming disposables. But I have t seen it.