Dash In Upper Marlboro is not your average gas and convenience store. We offer chef inspired fresh food, cold beverages, hot coffee and great deals on fuel - 24 hours a day. In need of a car wash? Our attached Splash In car wash offers the latest and greatest in eco-friendly car wash technology to keep your vehicle looking like new. Conveniently located nearby in Upper Marlboro, MD, Dash In goes the extra mile so that you can too.