Adam's, Chemical Guys, Optimum and DP Extreme.
Any of the above work well with the 2 bucket method and grit guard. No residue, great suds and slickness. A high quality shampoo will help prevent scratches and wax/sealant removal.
I personally use a pressure washer and Foam Cannon. Adam's Car Wash Shampoo is my go to because it smells good. :big_grin: