rusted fmf

Hey guys I got my blaster from some jackwagon who didn't believe in cleaning. It has an fmf gold series fatty with a power core 2 shorty. My question is the fatty is rusted pretty good and I tried cleaning it when I first got it but its too far gone. What do you think would make it more presentable? I figured I would get your thoughts.
 
Several different vids on Utube, search around. Q10 has done it, I've used it for couple things just testing. Don't think it would be good if you wanted to keep chrome. Kind of like reverse process of chrome plateing