How do you get rid of a jailbreak on an ipod?

Well it depends on your iPod generation. Just go on YouTube and type in

"iPod(your ipod's Generation) jailbreak untethered"

Example: iPod 2G Jailbreak Untethered

click on the one that you think is best for you and follow the insturctions.

I prefer Greenpois0n. Very easy

Hope this helped.