I just tried "Optimum Instant Detailer & Gloss Enhancer" for the first time and WOW!!! It leaves a beautiful glossy finish, not oily. It passes the "lightly drag your fingernails backwards over the surface" test with flying colors. I highly recommend using this after your Optimum No Rinse washes. You mix it 1:3 with water in a spray bottle, spray on and wipe off with a microfiber towel. It's $60 a gallon, but makes 4 gallons of mixed solution. I think it takes about 12 ounces total to do a typical sedan-sized vehicle. That's about $1.50 per treatment.
Thanks, Phil!
-Brad