There are a few ways to get weed smell out of a car vent. One way is to pour a potpourri or essential oil into the vent and then place the car in the sun. The heat will help to remove the smell. Another way is to put some baking soda and water in the vent and then place the car in the sun. The baking soda will help to clean out the vent and also kill any bacteria that may be present.
