Scientific tests have shown that better visibility is better. That will improve driving safety on the road. Promax Nano Rain Repellent uses the latest nano splashing technology to repel water drops while driving at a speed of 50km / h or more. This dramatically improves visibility in rain, day and night. Promax Nano Rain Repellent: Improve safety during driving Helps easily remove rain, salt, mud, bugs and dirt Reduces the wear and tear of your wipers Easy and convenient to use It is the best selling rain repellent. You and your passengers are safe when it comes to visibility in less-than-ideal driving conditions.