If you have a mold problem or suspect anything else, I recommend bleach. It will kill ANYTHING.
You must then rinse the whole chingaso several times to remove any trace of the bleach both for health reasons and taste. Use HOT water to rinse. Then hang it up someplace where it will dry. Make sure the tube will drain and be dry.
I use pretty much the same procedure cleaning my beer tapper. In between each keg I sterilize, not because I need to, but as a precaution.
gonzo