How to install a new copy of iOS 7 on iPhone 4S?

I want to delete and then install a clean version of iOS 7. How do i do that? Please give detailed answer.

Go to itunes, connect your phone.back up first. Then restore it.
give it a couple of min and it will do on its own.
keep your eyes on and sync it from the back up when its done.
make sure you have the latest version of itunes.
check for an update.

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