Mixing bleach and vinegar is not recommended as it creates a harmful chemical reaction that releases chlorine gas. Chlorine gas is toxic and can cause symptoms such as burning eyes, nose, and throat, difficulty breathing, tightness in the chest, nausea, vomiting, and potentially deadly pulmonary edema (fluid buildup in lungs) . Mixing any amount of bleach with even the smallest bit of vinegar creates this harmful chemical reaction. Chlorine gas is completely invisible, so the only way to detect it is by smell. It is important to avoid mixing bleach and vinegar and to call a professional cleaning company if needed.