Brake rotors and pads, so they move faster. Outside of the windshield to keep the wipers from chattering. Inside the gas tank so the gas comes out faster. On the tread portion of the tires so they spin faster. Oh, and don't forget inside the glove compartment and center console....makes it easier to get stuff out!
Ok, I've had enough fun. That'* great stuff to prevent moisture on the weatherstripping from freezing. Spray it on a rag, then wipe it on. You don't want to get the overspray on the leather. It probably won't discolor black, but it would my tan.....and it'* not good for it. Don't forget to do the seal on the trunk, and the small portion under the hood near the windshield wipers. If it comes with one of those little straw thingies, do the inside of all 3 locks!