Here's my tip if you've not got any money spare or don't want to spend anyhting don't go in the for sale section and look at anything Jez has posted or you'll find yourself swearing because he's nearly always got something nice that you'd like lol.
To remove rust I'd assume but of fine grade sand paper if its only surface rust, and then polish up with some auotsyl or metal polish of your choice.
Oh and for polishing something like a aluminium frame don't give yourself tired arms go and buy a car polisher you can get em for about 15 quid and will save you a lot of hard work, then just finish off the little bits you couldn't get too with it by hand