Microfiber towels have gained a tremendous following because they are reusable and do a great job at gripping onto dirt, germs and bacteria. But with anything that literally absorbs toxins, it's important to clean your microfiber towels, too. A simple technique is to run warm water from the tap and a few drops of dishwashing soap over them. Wring out the towel and microwave it on high for 90 seconds. This will kill germs and give you a fresh-smelling towel.