Last of a Breed

Ok, I have the High Polished BC Smoothie II's, and need some help/advice with cleaning them. They have alot of grime and dirt on them that seems to caked on. It's all spotted. I've tried washing them with normal car wash, and then using Billet polish without any luck. Is there any products out there that could help me clean them? Because if I can't clean my rims, I'm gonna be pissed. ANy help would be welcome. Thanks

Kevin