How to clean a iMac screen

markfromsydneymines wrote:

I've tried using a dampened microfibre cloth but it's leaving streaks..

Maybe it is too damp... Try using a Clean, Dry microfiber cloth after using the dampened one.

How to Clean Apple Products

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

The streaks are left by contaminants that do not evaporate. A clean cloth will not leave streaks.

Read: How to clean Mac products:

"If additional cleaning of the display panel or case is required use a soft, slightly damp, lint-free cloth. "

Are you using water to dampen your cloth or some cleaning product?

so far all i 've used is the little black cloth that came with my mac,no water , no nothing. it's worked great so far.