Will upgrading iPhone 4 to iOS 6 completely delete jailbreak?

I know it will get rid of jailbreak, which I don't mind at all. However, I have read through different forums that sometimes the jailbreak is never completely deleted because some files still remain in phone. I would not want that to be the case (I might as well not upgrade, I don't want those files possibly causing any performance problems).

So, what say you? I want to try iOS 6 on my iPhone 4.

I think this might depend on which jailbreak you've been using.

If you're using the really popular one and your last jailbroken version was iOS 5.1.1, I believe doing a full restore on your phone will "un-jailbreak" it. I'm not sure about versions prior to that.

I had my 4S jailbroken in iOS 5, then when iOS 6 came out, I restored my phone through iTunes and installed the updated version and I haven't had any problems with it at all since.

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