Function: Clean and decontaminate, reduce the friction between the wiper and the glass, and protect it. Instructions for use:This product is suitable for above zero degrees Celsius. Open the hood of the car, find the wiper, add a piece of wiper (if the glass is too dirty, it is recommended to add 2 pieces), wait for 5 minutes and then use it normally. A piece of conventional water can be exchanged with 4L of water. According to the normal volume of the liquid storage tanks, it is a piece of water, which can replace and be superior to traditional glass water! alert: This product should be stored in a cool dry place to avoid contact with children. Do not swallow! This product can not be used for antifreeze glass water! Only the cleaning function does not have antifreeze function. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.