I thought it was easy of just using soap and water? Usually whenever I wash my brother's car, we bring out the hose and pour the water into a bucket. Then we add some dish-detergent in there to make it smell good and bubbly. So, being that said, I think it is safe to use dish-detergent.
you'd better make damn sure with your new ride...wouldn't want to tarnish that paint and the eventual Tool bumper sticker