Diet Coke for Removing Rust?

[apoc4lypse]

I'd like to try the Diet Coke trick for removing rust on my Pro/Carbine's screws - good idea or bad idea?  Is the phosphoric acid in the Coke going to remove the bluing on the screws as well?

[Nitro]

ive used it to remove the rust off off of bumpers and my bikes pipes works grate when u use steal wool with it  in a pinch ive also used a ball of aluminum foil  as for taking more the rust off of what ever it is ur using it on i dont know