Never Mix Bleach with Ammonia or Vinegar

Mixing bleach with ammonia produces chloramine gas. Mixing bleach with vinegar produces chlorine gas. Both can cause serious respiratory harm and even death in enclosed spaces. This isn't a minor caution — it's a genuine safety rule.

Many common household cleaners contain one or the other without making it obvious. Always read labels before combining products. When in doubt, use one product at a time and rinse the surface thoroughly between switches.