Thanks for the suggestions. I was also told Comet cleanser and a stiff brush but I would want to try it first on a junk top and they are a little hard to find in junkyards these days.
Simple Green has worked well under the hood for degreasing but I did notice it will leave spots on the paint if used full strength.
Whatever I use, I'll probably consider using plastic and tape to cover the body to keep the solution from running over the paint.