The problem with bath toys generally isn’t on the outside. The plasticine feathers of a rubber ducky look clean because, by and large, they are (assuming no one has been peeing in the tub). But the inside is another matter. Squeeze bath toys don’t really dry out. They have no air circulation and, because they are opaque, light doesn’t really dry them out. That means the inside of a bath toy is damp and dark, ideal for growing mold. That light gray stain around the polar bear’s toes? Mold. That strange discoloration at the tip of the rubber ducky’s tail? Mold. And what’s worse, it won’t stay in there. Bath toys are not only cultivators of mold but conduits to the mouths of infants and toddlers.