1. Look at the design of the wiper blade‘s deflector and choose a deflector with an aerodynamic design to ensure that the wipers can be stably scraped at any driving speed.
2. Look at the material of the rubber strip and choose a good rubber strip, which can not only ensure the service life of the wiper, but also ensure that the wiper will not produce noise when scraping.
3. Look at the design of the wiper steel bar, choose a steel bar with high elasticity and stability, so as to ensure that the pressure of the wiper is evenly distributed on the windshield.
4.The wiper hanging state must be checked, if the wiper swing is not smooth or there is an irregular beat, or the wiper is not clean, it proves that the wiper is unqualified.