Play-Doh, the colourful dough children can use over and over again to mould and shape anything they image, must remain soft for use. No matter how you store Play-Doh, it will begin to dry out over time, making it hard or impossible to mould. Keep Play-Doh moist so it stays soft enough to be shaped by little hands.
Dampen a piece of paper towel. Ring as much water from the paper towel as possible.
Remove the Play-Doh from its container and wrap it in the paper towel.
Replace the Play-Doh, now wrapped in the damp paper towel, in its original container or another airtight container. Place the lid on the container and leave it overnight.
Remove the wrapped Play-Doh from the container the next day. Unwrap it and dispose of the paper towel. Replace the refreshed Play-Doh in the airtight container for storage. Repeat this process whenever the Play-Doh begins to become tough to mould.
Try other methods to moisten the clay: If the Play-Doh is stiff but still workable, knead a few drops of water into it to add moisture. If it's stiffer, hold the ball of Play-Doh over a pan of boiling water to allow the steam to add moisture back into the drying dough. Always store Play-Doh in an airtight container to keep the moisture in it from evaporating as quickly as it would otherwise.