How do I unclog a drain without chemicals?

Start by removing any visible debris from the drain opening. Then try using a plunger, making sure to cover the drain completely and plunge vigorously several times. For sinks, you can also remove and clean the P-trap under the sink, which is where clogs often collect. Another effective method is pouring boiling water down the drain slowly in two or three stages, letting it work between pours. You can also pour half a cup of baking soda followed by half a cup of white vinegar, let it fizz for 15 to 20 minutes, then flush with hot water. A drain snake or zip-it tool works well for pulling out hair and debris in bathroom drains.