Permanent marker on a whiteboard

Ok, now for a random Sunday tip…
Several months ago I purchased a little whiteboard that I could carry around. Well one day I apparently used permanent marker because it would not erase. “Oh great,” I thought, “it’s ruined.” Thankfully though, with the help Google, I was able to find a very simple fix using a plain old ordinary dry erase marker.
This is the kind of thing that some people just know, often taking that knowledge for granted. Thanks to the web that knowledge is just a Google search away, at least if it’s posted. I wonder how many useful tricks like this exist but are never put up on the web?