Review Of How Does Drano Work References. Just pour 16 ounces of the gel down your shower drain and. Drano is a very effective drain cleaner.

Drano max gel has a bleach formula that cuts through water and helps to break down hair, soap scum, and other debris. How long does it take drano to work? Drano works by delivering its special blend of sodium hydroxide, sodium metasilicate, and sodium hypochlorite (bleach) to the clog.