The term 'chemical in drain cleaners' refers to LYE, which is a common chemical used in many commercial drain cleaners. LYE is an alkaline substance that is highly corrosive and can be dangerous if handled improperly. It is often used to dissolve organic material such as grease, hair, and soap scum that can clog drains. LYE is also known by its chemical name, sodium hydroxide, and is sometimes referred to as caustic soda.