I used this stuff I bought at the auto parts store, it works great. I used it on the restore pictured in this thread http://badgerandblade.com/vb/showthread.php/342166-Beautiful-300PBT-restore-complete!
I have a friend who works at an optical lab. I don't know what it is he brings me in a lemonade bottle but it works terrific! He advised me to chill it before using it.