Using a Cleaning Disc.

Hi all

I want to clean the lazer and whatever on the DVD player on my iMac. I used to have a disc that worked great but it got wore out. Now none of the disks I use will work. I had an older memorex, then bought a new one. The DVD player says unsupported disc. Now this brand new one I bought wouldn't eject. I got really worried but finally after 10 minutes and a reboot it came out! Phew~!

My question; does anyone knnow of a brand that will work in the iMac? Don't remember the old one I had but it came in a DVD style case and not in a CD plastic box.

Thanks

Allen