Revive dried-up dry-erase markers by dipping the tip briefly in nail polish remover. Put the cap back on for a few minutes. Test in a corner to make sure it isn't going to damage your whiteboard. There are also water-based, low odor, dry-erase markers that can just be dipped in water like a regular marker. Make sure you know which kind you have!
For classroom environment, the cleanest, safest, and simplest method to revive dry erase markers is MARKERFIX. This is a marker revival tool. Simply insert your dried out marker into the barrel, rotate handle, and spin. You will end frustration of both teachers and students having to deal with dried out markers. Best is to spin all markers prior to class.
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