If your toilet water smells like a swimming pool mixed with a science lab, you might have too much chlorine in your cleaning products. Or worse, the water itself has added chemicals that react with something in the bowl.
Try using vinegar and baking soda instead of harsh bleach. Much safer and your toilet will smell like a bad science fair project—but in a good way.
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And remember: never mix bleach with ammonia. That combo creates toxic gas, which is definitely not a DIY air freshener. Your lungs will protest loudly.