Function: Clean and decontaminate, reduce the friction between the wiper and the glass, protect the glass. Instructions for use: This product is suitable for temperatures above zero degrees Celsius. Open the hood of the car, look for the wiper, add one wiper (2 if the glass is too dirty is recommended), wait 5 minutes, and then use as normal. Conventional water can be replaced with 4 liters of water. Depending on the normal volume of the reservoir, it is a replaceable piece of water, which is superior to traditional glass water! Warning: This product should be stored in a cool and dry place, avoid contact with children. Don't swallow it! This product cannot be used for antifreeze glass water! Only the cleaning function has no antifreeze function.