Sodium hydroxide (NaOH), also known as caustic soda or lye, is a strong alkali commonly found in floor cleaners. It is a highly corrosive substance that can cause severe skin burns and eye damage. Sodium hydroxide is used in floor cleaners due to its ability to break down dirt, grease, and grime. It is also effective in removing stains and disinfecting surfaces. However, due to its hazardous nature, it is important to handle sodium hydroxide with caution and follow the safety instructions provided by the manufacturer.