DD's bath ducks are grim inside- all scuzzy black stuff in em and when you squeeze out the water black scum also comes out. She likes to chew on them in the bath and I am scared that she will swallow some of the scum. Today I have tried bleaching insides (by sucking it up) but it hasn't got rid of all of it. And my S-I-L says that even ensuring all the water is squeezed out after every bath doesn't stop the scum. Has anyone discovered the magic wat to prevent this or am I going to have to buy her some new bath toys instead?