How to install the window water repellent agent *Please make sure to wash your car and wash away dirt and grime on the glass surface. Remove oil film and scale stains and apply underlayment. Remove the glass surface with the included degreaser just before applying the water repellent agent. Please apply the paint while it is completely dry. The included felt sponge contains a small amount of water repellent. Apply evenly like a small circle. In order to avoid leaving any residues, we apply fine paint both vertically and horizontally. After application, wipe dry in about 3 minutes. Please be careful not to use too much. Even with a large amount of use, the effect will not change. At 0.7 fl oz (20 ml), this product can be used for a single box class car. Please wipe thoroughly so that there is no residue left behind. As a fastening period, please keep it dry for 24 hours after installation. When working outdoors, if your car is not outside, please be careful of the next day. Do not work on days with extremely humid.