Classic Rust

[my EFin SI]

i need to clean up some rust spots on the rear wheel wells. i have no idea how to fix it. i want to do it a cheaply as i can, but dont want it to look cheap.
http://hphotos-snc1.fbcdn.net/hs128...._3941818_n.jpg passenger side

http://mail.google.com/mail/?account....1&disp=inline drivers side
help!