Polishing Cobra intake

I need to know which attachments you guys used to get into the grooves and small nooks and crannies in the intake when polishing, such as the plaque area and the contoured grooves in between the runners. I have a good sheen on the accessible parts, but I'm having trouble getting into the hard to reach areas. For those of you who did it, which types of bits/ attachments did you use? Specific brands and part numbers would be a HUGE help, since I have tried a bunch through trial and error and have not had much luck. Is there any special technique or tips you want to share? This will really help me get the underhood shining and sweet-looking.

Thanks
Lyle