A full body massage mat often comes with a user’s manual with instructions on how to care for it. However, the general rule of thumb is that they should never be immersed in water and washed because they are usually electrical devices. If your massager has a removable fabric cover, then you can remove it and wash separately. But if it doesn’t have a removable cover, then you will have to use a soft, damp sponge to gently clean it. And remember to do this only when the massager is unplugged and not in use.