If you’ve ever felt bad throwing away leftover oatmeal, here is a clever way to reuse it: Oatmeal is a great natural deodorizer, so place your excess in the fridge -- it will absorb and neutralize odors. Place cooked oatmeal in food storage containers that have traces of last week’s marinara sauce; it’ll absorb the smell, and it works better the longer it sits in the container. You can also make a paste using oatmeal, extra water and soap to give your pooch a bath. The oatmeal will help soothe his irritated skin and deodorize his fur. A little goes a long way, though, so use just a few spoonfuls.