Ammonia has a strong, suffocating odor. The disagreeable odor along with its ability to release deadly gases when combined with chlorine-containing products make it less than ideal as a household cleaner. Yet it is often used in its water-based form.
Ammonia should not be used on varnished surfaces, mirrors, marble, leather or soft plastics. It will also darken anything made of aluminum.
Warning: Never mix ammonia with any product containing chlorine – ammonium chloride releases a gas that can be deadly in sufficient concentrations. Since it’s a poison, store it away from the reach of young children. Ammonia is a strong irritant that can cause serious injury to the eyes and respiratory system. While working with ammonia, always wear a mask as well as skin and eye protection, and ensure adequate ventilation. A large portable fan directed at the work site may help provide fresh air.