In graphic arts, the fastest way to reset perception is the mirror trick -- just look at your work through the mirror, or, if you're in Photoshop, use Horizontal Flip.
However, the mirror trick never worked for me with user interfaces because the reading diagonal (what's the English term for this?) gets flipped, and various UI conventions such as the OK / Cancel button order get messed up.
For texts, just abstain from looking / editing / thinking about it for at least a few hours, or, ideally, days if you're not under a deadline. Unlike the mirror trick, this approach seems to be universal -- for me, it also worked for many things, including user interfaces and decisions in general.
The guy who taught me how to eat sushi a couple months ago explained that I should get a slice of ginger before trying a different kind of sushi in order to "reset my taste buds" (probably broscience) and feel the taste anew (it works). That's also the exact problem that programmers face when trying to design user interfaces: after looking at the thing for a long time, they grow blind to its shortcomings. A visual reset would come in handy. I imagine that resets could help in other areas too. Does anything like that exist? Cogsci majors, help!