Do You Want a Free Car Wash? At Overland Carwash we introduce special promo offers ranging from various general car wash cleaning services to more specific detailing options. One of the July 2018 options is the "Free Carwash" coupon that is valid throughout the month. By simply pre-paying for 3 OCW Special Washes for $99 you will get the OCW wash complete FREE! All you need to do to redeem the offer is present the coupon on your smartphone.