I just use old clothes cut up for rags. Not a problem getting free old shirts, towels, rags here for free. But when they are all greasy and oily what do you do with them? I don't feel it's environmentally responsible to just throw them in the trash, and go to a landfill, but what do you do with them? Washing them doesn't get rid of the problem either. Whether all the oil and grease goes down the drain washing them vs throwing them in the garbage to go to a landfill does not get rid of the problem. I not a greenie but I do try to not pollute my environment.