A clog dissolver is a chemical solution that is used to break down and dissolve clogs in drains. The most common type of clog dissolver is LYE, which is a caustic alkali composed of sodium hydroxide or potassium hydroxide. LYE is a highly effective clog dissolver, as it can break down organic matter such as grease, hair, and soap scum. It is important to use caution when using LYE, as it can be corrosive and cause skin irritation.