I would first pull the covers off and see if there is cleaning instructions.
However, I use micro fiber towels on all my vehicles for drying after washing as well as removing an applied wax product. I toss them in the washer all the time and use a fabric softener sheet with them in the dryer. They come out like new every time with no lint.
Do not wash them with any other garment, not even a t-shirt, and espeicially a cotton towel or you'll have lint trapped in them that will take forever to remove.
