Moldy Mishap | How to clean mold from a bottle If you are a mom and have a car, chances are pretty good you have found the occasional rouge bottle, sippy cup, sports bottle or coffee mug left in the car since…..who knows when. And when you DO find it, it’s full of mold! That’s what happened recently when our oldest daughter cleaned out her car………she found one of my favorite sport bottles that she “borrowed” weeks before. Here's how to clean it out.