Bleach and Vinegar Never mix bleach and vinegar because combining bleach with vinegar creates chlorine gas and is very dangerous.
Bleach and Ammonia Bleach should never be mixed with ammonia or cleaners that contain ammonia as it creates toxic chloramine vapors.
Bleach and Lemon Juice This is another combination that can create chlorine gas.
Bleach and Rubbing Alcohol The combination of bleach and rubbing alcohol produces chloroform and hydrochloric acid.
When it comes to bleach it's usually best to use it on its own because it's not always easy to be sure that ingredients are in other cleaners or what could react.