How to remove pinit.js image hover code

I am starting to regret adding this code to my website. It conflicts with my featured images by causing them to flash and disappear. I added the code directly from the pinterest site onto one post and it has since spawned itself everywhere. I know what it should look like but can’t find where to remove the code – it’s not showing up in the html editor of any of my original posts or pages. Where is this code now based and how do I go about removing it entirely? Where did the pinit.js javascript go and why am I unable to remove it the same way that I added it?