We use a product called ”Slugger” it’s nothing fancy just a good soap with lot’s of show. We also sell an industrial degreaser called Citrisolve that is dispensed in 2 gal pump up sprayers. Our wash is self serve with wands and brushes and foam guns. We run 120f water @ 1,800psi. Our sump (or pit) runs 100’ feet of our 110 foot bays and is 78” wide and 60” deep. It’s covered by 3/16” steel grating.