When I still had a white car, I had found that applying Pinnacle crystal mist quick detailer (way back when I was still a Pinnacle fan!) after washing the car had a phenomenal effect on how glossy the car looked afterwards.

Of course, I made sure I had polished the paint and had wax on the car before I ever even thought of spraying on the quick detailer (quick detailers offers no paint protection whatsoever), but quick detailers truly help give cars that showroom shine -- even on white cars!

You might want to give that a shot, keep a bottle handy in the trunk after you've gotten your car detailed. After you've cleaned your car, spray it on, step back and enjoy the shine!

Good luck!