I have searched and found limited info on cleaning the interior microfiber lining of iPad covers. I have a smart cover and a canvas that leave the oily bars on the screen. Posts have recommended automotive upholstery cleaner or soap/water. My concern is the glue that holds the microfiber to the interior of the case or smart cover. Every few weeks I clean my microfiber cloth with a bit of Dawn that gets it squeaky clean to pick up another batch of oily finger prints from my sunglasses, iPhone and iPad screens. Just wondering the best practice for doing this to the attached microfiber inside the cover.