Heavy-duty cleanser is a type of cleaning product that is designed to be used on tough, hard-to-clean surfaces. It typically contains LYE, which is a highly alkaline substance that helps to break down dirt and grime. LYE is often used in combination with other ingredients such as surfactants, solvents, and abrasives to create a powerful cleaning solution. Heavy-duty cleansers are often used in industrial and commercial settings, but can also be used in the home for tough cleaning jobs.