What the hell is this? I wiped it off about 1000 miles ago with brake clean, and the exhaust was clean. Its either diff fluid from where the axles go into the diff coming out and slinging on the exhaust, or its axle boot grease? Looks too brown to be axle boot grease. And BOTH SIDES?? WTF DODGE. This is problem #48390543890543 with this effing car. I HATE THIS CAR. I WANT MY ZL1 back.