<human>:  What's the best way to prevent rust on a car?
<bot>: The best way to prevent rust on a car is to regularly wash the exterior and wax it at least once a year. Also, check for rust spots often and treat them as soon as possible with paint or rust converter. To further protect against rust, make sure the undercarriage is coated, use rust inhibitors and coatings, and park in a dry, covered area.