If you've ever looked into your bathroom and wondered when exactly your grout started competing for the title of "Darkest Corner of the House," you're not alone. The humid air, water droplets, and that ever-present hint of neglect create the perfect environment for mold, dirt, and unspeakable stains that just won't go away despite daily cleaning. And once your grout starts to darken, it feels like you've lost the battle for cleanliness.