I soak kitchen linens [towels, rags, cloths] overnight in my washer. Regular detergent + Borax + non-chlorine bleach. Gets out grease, coffee/wine/berry stains, general kitchen yuck. If ya wanna be healthy, ya gotta cook. This means kitchen mess. Clean kitchen linens = a more cheerful cook!
My late grandmother taught me this secret. PS: the non-chlorine bleach keeps the colours from fading.