A method of mitigating rear end contamination of a vehicle while driving using an active spoiler system includes providing an active rear spoiler to a square back vehicle. Next, determinations are if the vehicle speed is greater than a predetermined threshold, if the rear end of the vehicle is contaminated, and if the vehicle wipers are on. The method then moves to deploying the active rear spoiler when the vehicle speed is greater than a predetermined threshold, the rear end is contaminated, and the vehicle wipers are on.