Symptoms
- Water empties slowly after washing tools or clothes
- Standing water lingers longer than expected
- Grimy residue visible around the drain opening
- Slower drainage noticed gradually over weeks
Likely causes
- CommonLint and detergent residue buildupLaundry sinks especially collect lint that combines with soap into a sludge.
- CommonDirt or sediment from cleaning tools or paint brushesUtility sinks often handle dirtier water than typical fixtures.
- PossibleClog in the trapDebris settling in the P-trap under the sink.
- PossibleShared line clog with a nearby washing machine standpipeIf plumbed together, a clog in one can slow the other.
What to do
- Avoid rinsing paint, heavy dirt, or plaster directly down the drain going forward, since these are common causes of buildup.
- Plunge the sink drain firmly with the overflow (if present) covered.
- Pour a baking soda and vinegar mix down the drain, let sit 15 minutes, then flush with hot water.
- If still slow, remove and clean the P-trap under the sink, checking for lint, dirt, or sludge buildup.
- For a persistent clog, use a hand-crank drain snake through the trap arm toward the wall.
- If the sink shares a line with a washing machine standpipe, check that connection for lint buildup as well.
- Run water afterward to confirm normal drainage.
Tools and parts
- Plunger
- Adjustable pliers
- Baking soda
- Vinegar
- Hand-crank drain snake
When to call a pro
Call a plumber if cleaning the trap and snaking doesn't restore normal drainage, since the clog may extend further down a shared line.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.