Use dry to dust, clean smudges and finger prints. Can be used damp with water or your choice of cleaner for very dirty areas, buff with dry cloth. Microfiber will not scratch surface but embedded dirt could. Suggest washing frequently. Wash and reuse hundreds of times. Works great on jewelry and photos too! Care instructions: Machine or hand wash (do not use fabric softeners) with your choice of detergent. Use dryer or hang to dry. $2.95 + $1.00 S/H Each