hey, i dont know about you guys, but my towels get DIRTY. when i put them in the wash with all or any other detergent, it never gets the dirt / grease out. in fact, it almost never takes the stain away. are there any very heavy duty products that will not harm the MF or cotton towels? i usually use the cotton ones for cleaning up oil or my wheels.tires, so they get pretty nasty, while i use the MF's for QD'ing, windows, etc. also, i have a few of the ABSORBERS, and they are impossible to get clean. once they have dirt on them i cant get it out. please help and let me know, thanks!