Somewhere I read that washing your microfiber drying towels in vinegar can help restore absorbancy and you have to use a lot for it to work. So I soaked all my old (and a few new) drying microfiber (WWs) towels in a strong vinegar solution and then washed them. Afterward, they weren't nearly as absorbant as they were before, and even after a few washes with degreaser as the soap, they still aren't performing properly. So don't try it. Distilled Vinegar does not restore absorbancy.