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Mildew in Sippy Cup Valves
Hi, this may be a wierd question, but my daughter has been using Playtex sippy cups with the straw. The straw is much like a valve--it has an upper part which has the straw head along with a valve and then you plug the bottom portion of the staw into the valve. It's much like a regular valve for a sippy cup, only it's a straw. Anyways, I have noticed that the straws and valves are getting mildew in them. I clean after every use, I shake them out best I can, but they are still getting mildew. Do I have to buy all new cups? Is there a...
