I'm sorry for such simple question but what is the best and safest way to clean DVD lens? Couple days ago my player (Sony DVR-...) began to have some problem with reading/playing DVDs. Sometimes when I insert recorded Taiyo Yuden DVD+R, the player just reads "C 13:00" error, but after ejecting and inserting again it is working properly. I think the problem is in DVD lens. Or maybe I'm wrong??? Thank you.