What is the best way to adjust car rearview mirrors?

[Gary]

The optimal angle for adjusting car rearview mirrors is when the driver can see the rear door handles of vehicles on both sides from the driver's seat. Here are several solutions for dealing with invisible rearview mirrors during rainy days: 1. Heated rearview mirrors: Many modern cars are equipped with this feature, which works well in light rain; however, it becomes ineffective in heavy rain. For safety, the best approach is to find a safe place to park and wait for the rain to subside. 2. Installing rain guards: Adding a rain guard, also known as a "rain visor," to the rearview mirrors can effectively prevent rainwater from accumulating on them. When driving against heavy rain, the rain guard protects the mirrors, keeping them almost as clear as on a normal day, ensuring good visibility. 3. Special rain repellent: Using a dedicated rain repellent, commonly referred to as "car rain repellent," applied to the rearview mirrors during rain, can effectively eliminate the impact of rainwater.