For minor clogs, pour a kettle of boiling water down the drain. It can often dissolve and dislodge grease and soap scum on its own.
Ten Ways to Unclog a Drain Without Harsh Chemicals

Unclogging drains is a common household task, and there are several handy methods for clearing a clog without harsh chemicals or a call to a professional. Here are some effective options to try.
Boiling Water
Baking Soda and Vinegar
Pour 1/2 cup of baking soda down the drain, follow it with 1/2 cup of vinegar, let the mixture sit for 15 to 30 minutes, then flush with hot water.
Plunger
A plunger designed for sinks can create a seal over the drain; plunging vigorously often dislodges the clog.
Wire Hanger or Drain Snake
Straighten a wire hanger and bend a small hook at the end to pull out hair and debris, or use a drain snake for deeper clogs.
Baking Soda and Salt
Combine 1/2 cup of baking soda with 1/2 cup of table salt, pour it down the drain, let it sit for a few hours or overnight, then flush with hot water.
Wet/Dry Vacuum
Set a wet/dry vacuum to vacuum liquids, create a tight seal around the drain, and use it to suck out the clog.
Dish Soap and Hot Water
Pour a good amount of dish soap down the drain followed by very hot, not boiling, water. The soap helps lubricate and break up the clog.
Alka-Seltzer and Vinegar
Drop a couple of Alka-Seltzer tablets down the drain, follow with a cup of vinegar, wait 10 to 15 minutes, then flush with hot water.
Chemical Drain Cleaners as a Last Resort
If nothing else works, a chemical drain cleaner can help, but follow the manufacturer's instructions carefully and use caution, since these products can be harmful.
Prevent Future Clogs
Use drain strainers or stoppers to catch debris, clean them regularly, and avoid putting large food scraps, hair, or grease down the drain. If a clog persists or feels beyond a DIY fix, it's best to call a professional plumber.
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