If you’re training a puppy or have an elderly dog prone to accidents, you aren’t always going to be there with cleaning supplies when a mishap occurs. When you scan your carpet with a blacklight flashlight, patches you’ve missed will emit fluorescent light, allowing you to deep clean problem areas more easily. A smaller flashlight will help you look into smaller corners and spaces under furniture. To optimize the power of your blacklight flashlight, always be sure your surroundings are as dark as possible. If you live in a city or have a streetlight just outside your living room window, make sure the shades are closed, and consider blocking any cracks of light from under your door with a towel. Results may be harder to distinguish on darker rugs or carpet, but if you’ve committed to using blacklight to attack messes, you can keep light-colored carpet looking fresh and new. While most people probably purchase a blacklight flashlight for cleanup purposes, the fluorescent world is not a total horror show. Antique collectors can use them to recognize uranium glass, and geologists can check out fluorescent minerals. Just be sure to follow the safety instructions for your light to protect your eyes and minimize your exposure to radiation.