Function Clean and purify, reduce friction between wipers and glass, and protect them. How to use Open the car hood, find the wiper, add one wiper (if the glass is too dirty, it is recommended to add two), and wait for 5 minutes before it can be used normally. A piece of ordinary water can be exchanged with 4L of water. According to the normal volume of the storage tank, it is a piece of water that can replace traditional glass water and is superior to traditional glass water! Warning 1. Don't swallow! 2. This product should be stored in a cool and dry place, avoiding contact with children. 3. This product is suitable for environments above zero degrees Celsius. It only has cleaning function and does not have antifreeze function. Note: The packaging of different production batches may differ from the pictures, but the internal products are the same. Please be aware of this situation. This is a effervescent tablet, not a liquid, you must mix it with water before use. 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.