I've seen images off the television on commercials and on television shows that I just wanted to Brillo pad it. Yuck, now what DO we do with those images? Recently the buzz on television and the internet has been the Miley Cyrus issue. I do not know what that is about as I've been making sure I don't have to use a Brillo pad on my forehead. However, this could be your question on the issue, 'what do I do now?'
Well, since you cannot Brillo pad your thoughts like you want to, you can take every thought captive and change what you are thinking about.
Jesus says we ought think on things that are true, honest, right, pure, lovely, good report / praise worthy, and virtue. I think Jesus knew we would one day desire to erase the things we see or even hear and that is why He has told us such things. Now, is it easy to do? Absolutely not, at least not in our own power, but with God it is possible. Take the opportunity to tell Him what your thinking, He knows already, and then ask Him to help you with thinking on those things listed in Philippians 4:8.
You might be surprised how He changes your ungodly images to glorious ones.
~Be encouraged, you are not alone with wanting to erase images from your thought process.