A class-action lawsuit filed in the US District Court for the Northern District of California accuses Apple of using literally dirty design tactics with its iMac and MacBook computer systems. More specifically, the lawsuit alleges that some iMac and MacBook owners report “consistent problems with dark smudges on their screens” and other problems

Source: Hot Hardware – Apple Slapped With Class-Action Lawsuit Over Dirty MacBooks And iMacs Lacking Dust Filters