[stevehertz]

Unless you want to get into more detailed and involved treatments that take lots of time and the removal of parts etc, a quick fix is to remove the surface rust using a scotch pad (green washing up pad), then wipe the area with a cloth soaked in WD40 to blend it in. It will then take on more of black appearance than 'rust', and it won't rust again if kept indoors at normal temperature and humidity.

Edit, just noticed that PJL has posted a similar procedure above.