Today I was watching Despicable Me on blu ray and it kept skipping just after chapter 10 started - one of my favorite parts! So I took the disc out and looked at it. There were a few spots that weren't perfect, but I didn't think they would cause skipping. So I cleaned it really good and tried it again. It still skipped. This concerned me because I had just bought and returned a used copy of The Sum of All Fears and it skipped about 35 minutes (1hr10min - 1hr45min). So I remembered I had a lens cleaning disc (took me forever to find it) and I ran it through. I put my movie back in and selected chapter 10, and it played perfectly! Hooray! I kind of thought these discs were a bit of a gimmick, but it seems to have made a difference for me. I don't know how much of a difference the cleaning disc can make but it certainly helped me today.
What are your experiences with cleaning discs? Do you run them regularly? Mine said to use it every 50 hours, which I definitely don't.