Drano has your back with maximum strength for your worst clogs - or your money back. Visit DRANO.com for details. Drano Max Build-Up Remover treats your drain before it becomes clogged. With a unique formula containing natural enzymes and bacteria, Drano Max Build-Up Remover helps prevent clogs from blocking your pipes. Use it on a monthly basis to help prevent plumbing problems and keep your drains running smoothly. The more build-up you remove now, the less likely it is that you'll need a drain cleaner to unclog your drain later. An ounce of prevention is worth a pound of cure.