How to prevent rust on my car?

I recently purchased a used BMW and noticed some rust spots on the exterior. How can I prevent rust from spreading and damaging my car even further? Any advice would be greatly appreciated.

First and foremost, regularly washing and waxing your car can help protect against rust. Using a rust inhibitor spray on any existing rust spots can also slow down its spread. Additionally, make sure to take care of any scratches or chips in the paint, as they can be entry points for rust.

Another way to prevent rust is to keep your car dry. This means avoiding parking near bodies of water or in areas with high humidity. If you live in an area with harsh winters, make sure to wash off any road salt from the undercarriage of your car to prevent rust from forming.

You can also consider investing in rust-proofing treatments for your car. These can be done at a dealership or by a professional specializing in rust prevention. While they may be an extra expense, they can greatly extend the lifespan of your car's exterior.