Learn More › When your sink or shower drain ... and hot water to sit for at least an hour. Step 4: Flush the drain with water. After an hour has passed, run the sink or tub tap for a few minutes ...

Each unblocker was tested twice. As most of these shower drain unblockers are bleach based, we recommend wearing gloves over a long-sleeved top for your protection. Just make sure it's not a piece of ...