I want to unjailbreak my iPhone 4s

I see no advantages from staying in jail break. I think I jail-broke it using evasiOn. I have tried restore (not from backup) from iTunes. I've tried full reset everything, then restore from backup. I've tried the DFU mode approach. None have worked; Cydia & 1 other associated apps are still on the iPhone I think I'm stuck on iOS 6.1.2 which I think is caused by the jailbreak.
I'm open to anything that works, but please explain fully the procedure: the only thing I need to understand is exactly how to do it. I've had an iPhone for the first time last Nov. 2012.

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