Why can't the windshield wipers clean the front windshield properly on rainy days?

[DelStephen]

When the front windshield cannot be cleaned properly by the wipers during rain, it is usually due to damaged wiper blades. Solution: Replace the wiper blades. Here are some relevant details: 1. There is no standard replacement interval for car wiper blades, but it is generally recommended to replace them once a year. If the wipers still perform well and show no signs of aging, the replacement can be delayed. The most important factor is the condition of the wipers themselves. 2. If it has been less than a year but there is already noticeable unclean wiping during use, replacement is necessary. 3. On some high-end cars, there is a black dot on the far right of the wiper blade, which turns yellow over time and indicates that the blade should be replaced.