I know you all have those mounds of markers, some of which the kids didn't quite get the caps back on tightly. I did a full-fledged marker clean up and sort-through about a year ago, but since the girls had recently imbibed in a marker fest, I grabbed their stash (Oh yes, I keep my coveted collection separate. One should never mess with my office supplies.) from the kitchen table and ditched those that had served their time. For those that needed some help, I breathed a little life back in them.
Heat a small amount of water (I think there was about 1/4 cup in here) in microwave safe glassware until quite warm (not boiling!). Dip your ailing marker in the water for about one circle's worth of "swish time". Put the cover back on the market, wipe any excess color that might have oozed out, and that's it! Just let them sit for a while unused, and you will be pleasantly surprised next time you use them. Consider yourself a healer.
Rejoice in Marker Revival