No, you don't need to. That said, our data shows that clean cars are more likely to sell.
If your car is dirty, we do recommend that you clean it inside and out before taking photos. Similarly, if your car is dirty, we recommend that you clean it before showing it to a prospective buyer (our test drive checklist will walk you through test drive preparations when the time is right).
If you select a Plus or Premium listing, save your dated car wash receipt, send it to firstname.lastname@example.org, and we'll reimburse you up to $20 if you're a Plus seller, and up to $50 if you're a Premium seller.
For more information, check out our seller's prep guide.