My kids love their play dough, but I wince at the thought of throwing away even small bits because they've dried out. But I found a way to re-hydrate play dough! Take a gallon ziploc bag, and put all of the dried out scraps inside of it along with a very wet paper towel. Leave this somewhere, like the top of your fridge, for as long as two to three days. Works every time.
Earth Friendly Play Dough