This might just work! How much would it cost you to offer a free car-wash coupon that's redeemable at local full-service car washes? I would write blog posts

This might just work! How much would it cost you to offer a free car-wash coupon that's redeemable at local full-service car washes? I would write blog posts on interesting success stories with different types of cars and seller stories -- often cars are hard to sell for various reasons. Offering to take a professional picture is your ultimate in.