The answer is that mixing bleach with detergents can create dangerous fumes. Combining the two chemicals is a real health hazard, not just an ineffective cleaning method.
This isn't a rare mistake — it's an easy one to make if you're rinsing a detergent wash straight into a bleach soak without a clear-water rinse in between. Always check labels before combining any two cleaning chemicals, and never assume "stronger together" is safe.
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