If your mother told you not to mix bleach with ammonia, listen: The two combine to create a toxic gas called chloramine, which at low levels causes wheezing, coughing, nausea and watery eyes, and at higher concentrations can do irreversible damage to the lungs
. But mixing bleach with any acidic cleaner (regular old vinegar as well as many drain cleaners, toilet bowl cleaners, dishwasher rinses, rust removers and more
) is just as dangerous. It also produces a toxic gas, chlorine, which can cause dizziness, coughing, and burning in the nose or eyes
when you're exposed to a small amount and can be fatal at higher levels.