“The advice for cleaning microfibre towels/cloths is to use a liquid non bio (the crystals in washing powder may not break down fully, embed in the microfibre and could potentially scratch the surface they are used on. My experience is that they work well, but don't always rinse fully. Microrestore does. This makes it especially good for glass cleaning cloths where any residue from the wash smears the glass. This is am amazing product and well worth the money.”