Vinegar
you wash it????
stick an air freshener in the interior vent
Go to a professional cleaning supplier and ask them. They have the knowledge and the products to do the job.
"The musty smell of the attic filled my nostrils" BWHAHAHAHAHAHAH
The first step to getting a musty smell out of a closed up house is to open the windows. You will also want to burn some candles. Spraying Lysol will also help get rid of the musty smell.
Take it for dry cleaning...
spray
The musty smell that Brian notices when he wakes up is caused by the dampness and mold growth in the shelter. The combination of moisture and lack of ventilation can create a musty odor.
Bleach
wash everything and febreze...
Put Olive oil on it every day for 3 days, and the smell should leave.
By purchasing a car with cloth seats.