Cleaning scanner glass?

I have a HP 3310 all-in-one printer scanner. The glass is very dusty underneath and I would like to clean it to improve the quality of photos I am scanning. There isn't any information via HP on how to clean the underside of the glass. I have removed two screws from the front left and front right of the scanner but there is something holding the 'frame' in place at the back. Some online help sites say to press clips (on other scannners) but I don't see anything obvious here. Has anyone managed to accomplish this?

Answers:
Here you GO..
http://h20000.www2.hp.com/bizsupport/tec...

http://www.ehow.com/how_14267_clean-scan...

http://printscan.about.com/cs/scanners/q...

Hope it helped you...

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