It might be time to replace your plastic ice cube trays. Traditional hard plastic trays usually contain chemical BPA, which is something many of us avoid due to the fact it has been linked as a possible endocrine disrupter. Hard ice cube trays can also get scratches, leading to microscopic areas where harmful bacterial can grow. When it's time to fill up, consider silicone instead. Silicone trays have zero chance of chemical leaching, and they come in a variety of fun shapes and sizes to make pretty cool ice cubes, too.