I've recently installed/deleted alot of apps and packages... I feel that the constant deletions have left me with a bunch of junk files that have not yet been fully discarded, and are thus taking up unneccessary space. I only have 13 apps installed, and yet it tells me that they take up 2GB of space, which seems unreasonable. They are relatively small apps too... mostly 5-10 MB each.

I have no pictures of videos or any such other multimedia, nor do I have anything on my iPod, which is why I think the wasted space comes mostly from deleted/junk files.

How do I clean up these "junk files"? Are there any apps, or any commands I can execute to do this?