How to Unblock a Drain (DIY Steps Before You Call)

A slow or blocked drain is one of the most common callouts — but many are fixable with basic steps. This guide walks the safe DIY options in order, and flags the signs that mean you should stop and call a pro.

Try the plunger first

A plunger is the cheapest first move. For a sink, block the overflow, cover the drain, and pump firmly. For a toilet, use a dedicated flange plunger. Several firm strokes can shift a surface blockage without any chemicals.

Boiling water and baking soda

For a grease build-up, pour a kettle of boiling water down the drain, then half a cup of baking soda followed by a cup of vinegar — the fizz can break down soap scum. Leave it 15 minutes, then flush with more hot water.

When to stop and call a pro

If the block persists, water rises in other drains, or you hear gurgling in multiple fixtures, it may be a main-line issue. Repeated clogs in the same drain, or a bad smell, often mean a deeper problem best diagnosed with a camera.

Professional methods

A plumber clears stubborn clogs with a drain snake, hydro-jetting (high-pressure water), and camera inspection to find the actual cause. For a main-line backup or recurring clogs, this is worth the cost versus repeated DIY attempts.