Q: what is the best way to clean the imac screen?

A lot of forum users will disagree with me, but I use a bottle of pump spray eyeglass cleaner sprayed onto a folded paper towel. It works for me. I figure that if the cleaner is good enough for coated plastic lenses, it should be safe for the iMac glass. And a soft paper towel doesn't seem deadly either.

Apple strongly recommends DO NOT USE ANY CHEMICALS.

Use a lightly damp clothe with water only and clean your screen.

http://support.apple.com/kb/HT3226

I almost forgot Welcome to the Discussions Heidi.

Cheers.

Don

For my iMac and MacBook Pro screens, I've always used just a damp soft cotton towel.  This has always been effective in removing all kinds of smudges, sneezes, and who knows what else that's gotten stuck to the screen.