If I buy a Used Phone How Do I Wipe It if it was Rooted

I am thinking of buying a used phone to register on RingPlus or another MVO that gives free service.

I figure I would buy one from Amazon not off craigslist so i have a pretty good chance it isn't stolen.

But if the previous user downloaded spyware or if they rooted it and screwed with it I would like to have it Fresh like it was from the factory.

I figure Factory Reset is pretty useless if they rooted it or spyware is deep in it but I don't know that much about what the best way to deal with a used phone is.

I don't want to flash a rom to it off the net. I would rather it be just like factory new.

Is this possible or should i just buy new?

If i brought it to a sprint store would they do it? are they able to do it?

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