iPhone asking for Apple ID for a former roommate At some point several years ago a former roommate used my phone or iTunes for something. I can't recall for what, but since then each time I get a new phone, or need to restore from a backup, I'm prompted to login with her Apple ID. In the past I would just cancel out of the login prompt a couple of times and then it wouldn't happen anymore (at least until the next time I needed a restore).

I just got the iPhone 6 and have been trying to get everything setup, but this time canceling out doesn't appear to be doing the trick. It keeps prompting me for it and will not finish the initial iCloud restore until I've logged in as her. I have no idea what app(s) or music on my phone would be attached to her account, but I would gladly delete them.

Is there a way to unassociate her account with my phone, or at the very least determine which apps are apparently tied to her account so I can remove them?

EDIT (11/23/2014)

The solution marked below should work. What ended up happening with my issue was that I kept declining the prompt and after several hours it finally offered to finish the sync and said that anything I hadn't logged in for would be permanently removed. I said that was ok and it finished the restore.
I suppose you restored your iPhone 6 from a backup of your older phone. If I understand the issue well enough, the phone keeps asking you for your friend password because you have an app that is his. If this app is on your computer in iTunes, there is a solution.

In the iTunes' list view of your Apps, right-click on an app, "Get info" (or just press cmd ⌘+I), and, depending on your OS version, either go to the Summary or the File tab. The Apple ID of the buyer, as well as his name, will appear, and you just have to go through your files (pressing cmd ⌘+P and cmd ⌘+N) until you find the culprit. 

Unfortunately, iTunes cannot sort apps by buyer. However, you could sort Apps by "Date Added" in the list view to make the whole process much easier.