How do you delete old character saves on ME 1 And ME 2?

 Ok when you import a character or change careers why is there not a option for deleting any old characters that you dont want, I have 42 characters because I cant delete the ones i dont want, i delete the game save but the characters are still there. wtf?? someone help 

this is for xbox 360 only

You're pretty much fudged dude.