I've got the secret sauce for IR!!
I recently bought a 60ST60 from BB with a whopping 3300 hours on it!! I bought it to potentially replace my 60ZT60 but will keep the ST as backup. Actually, I just might keep the ZT as backup and use the ST60 as my primary TV (there are some things I like better on the ST than ZT). Anyway, the 60ST60 had the dreaded "Panasonic" logo imbedded right in middle of the screen but at $849 with no stand, I took it anyway as I had a hunch that I could get that "burn-in" out!! Well, I'm happy to report that it is fading!! Moreover, without the use of Pixel Filpper!
What is the secret sauce, you may ask? Well, it ain't a secret...I've been using these slides: http://www.eaprogramming.com/downloads/download_main.htm
I've run the slides for a little over 100 hours now and the letters are definitely getting lighter and I can barely make out the logo during bright scenes while watching normal content. A friend of mine borrowed my Pixel flipper disc so I'll try that when it's returned. Incidentally, I was able to remove the "pink box" IR caused by the demo banner at the bottom of the screen on the 50ST60 demo I sold. That same "pink box" IR is fading on my friend's 60ST60.
I stumbled on the effectiveness of using these slides over D-Nice's slides (I am acutely aware that his slides are not meant to remove IR) a few months ago while using Evangelos slides to get rid of the Fox logo after football games. However, I also noticed that it was easier to acquire IR on the ZT and it was slightly less responsive to removal using the color slides. Further, D'Nice's color slides were less effective than Evangelos slides and Screen Wipe seemingly had no effect.
Anyway, if I were spending over $2000 on a TV, I probably wouldn't have taken a chance on a display that had what appeared to be burn-in. But with the price I paid, it was worth a shot and I'm happy to see that the image retention is improving.
Long story short, use a combination of Evangelos slides (I have a theory why it works) and Pixel Flipper for the best results.