Castrol Super Clean works fairly well, just make sure you wear latex or blue nitrile gloves. It will dry out your hands big time
. Also, keep it away from your painted surfaces, like that new paint job on your truck. It will damage the finish. If you have an aluminum manifold with a bright finish, it will tarnish it. It must have some kind of acid in it, but I am not sure. Some old timer told me to use kerosene or diesel, but I have never tried it. I have noticed a "kerosene" odor when using the rattle can "Gunk engine brite".........
