How can I prevent rust on my Ford Mondeo's undercarriage?

I recently purchased a used Ford Mondeo and noticed some rust on the undercarriage. I'm worried about it getting worse and causing damage to the car. What can I do to prevent rust and protect my car?

Regularly wash the undercarriage of your car to remove any dirt or salt that can cause rust. You can also apply a rust inhibitor to protect against corrosion.

Coat the undercarriage with a layer of oil or wax to prevent water and salt from coming into contact with the metal.