Seriously, who knew! Apparently Centsational Girl did. Check out her site HERE. She has this amazing tip on her website, and if you're like me....you could use this from time to time. I've got a nightstand with a water mark on it, and I'm going to see if this works (just as soon as I get some mayo from the store!). To remove a watermark from wood, simply apply a coat of mayo to the watermark and let it sit for at least 4 hours (preferably overnight). Wipe it clean the next day and there should be not trace of the watermark.