Simple Green has a new line out called Pro series for cars. I used it last weekend on my car, which was up on a lift. Engine compartment, fender wells, suspension, and undercarriage all came out great. Easy to use. Wet down the parts you want to clean with water. Spray on Simple Green and let it stand for a few minutes. I used a wheel wash brush to scrub the parts. Spray off with water. The quart spray bottle was $3.99 at Pep Boys.