This magical dishrag lends itself to the task at hand. When you grope for it in the sink, it is always there. Furthermore, when you find it, it is always in a good configuration and orientation for doing whatever it is you are about to do. Washing a plate? You’ll find it spread out and ready to spread over the plate’s surface. Washing a glass? You’ll find it wadded up in a perfect size and shape to fit into the glass to wash it. Those are just two examples out of basically unlimited possibilities. And you don’t have to think about it. Just wash the dishes and do your thing, and the dishrag will make your task go more smoothly.
Appearance-wise, any dishrag can be enchanted in this way, so, like their mundane counterparts, a magical dishrag can be any combination of materials and colors, patterns, etc. A magical dishrag will never become stained or moldy. It won’t wear out from regular use, but it can be deliberately destroyed.