How to Clean a Slow or Greasy Kitchen Drain
Kitchen sink drains slow down from grease, soap scum, and food debris building up on the inside of the drain pipe. Grease is the primary culprit — it solidifies on the cooler pipe walls and gradually reduces flow. Regular maintenance prevents full blockages.
Maintenance Method: Baking Soda + Boiling Water
This is the simplest and most effective regular drain maintenance routine:
- Remove any visible debris from the drain strainer
- Pour 1/2 cup of baking soda down the drain
- Follow with 1 cup of white vinegar — it will fizz aggressively. This fizzing action helps break up loose grease and soap buildup.
- Allow the fizzing to work for 10–15 minutes
- Flush with a full kettle of boiling water — the heat melts and flushes the grease loosened by the baking soda and vinegar
- Follow with running hot tap water for 30 seconds
Important: Only pour boiling water directly into a metal drain pipe. For PVC pipes (most homes built since the 1990s), use very hot tap water rather than boiling water — boiling water can soften PVC joints over time.
For a Significantly Slow Drain (Partial Blockage)
- Pour 1/2 cup of baking soda, then 1/2 cup of salt down the drain — the coarser salt acts as a mild abrasive to help scour the pipe walls
- Allow 30 minutes without running water
- Flush with hot (not boiling) water for 60 seconds
- Apply a commercial drain maintainer product like Drano Max Gel — allow as directed, then flush
Preventing Grease Buildup
- Never pour cooking oil or liquid grease down the drain — pour into a container, let solidify, and dispose in the trash
- Run hot water for 30 seconds before and after washing greasy dishes — this keeps grease in solution longer so it flows further before solidifying
- Use a drain strainer to catch food particles
- Run the baking soda + vinegar flush monthly as preventive maintenance
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