I like Optimum No Rinse (ONR)...the best product I have found to date for washing the exterior of any car. Follow the directions EXACTLY on the bottle and use first quality, clean microfiber towels to apply. I use the 8 oz/gal of water ratio for removing bugs and sap with a plush microfiber towel. Have used this stuff at car shows for years--great product.
And btw I have nothing to do with the company, just a satisfied user.