Drano® has your back with maximum strength for your worst clogs--or your money back. Visit drano.com for details. Drano® Max Gel Clog Remover--unclog your drain with a maximum-strength gel formula. Drano® Max Gel pours through standing water and works fast to clear clogged drains and restore them to a free-flowing state. Safe for all pipes, it works great to remove hair, soap scum, and other gunky clogs.