Rotten Egg Smell Coming From Washing Machine? Fix It

A rotten egg smell coming from a washing machine is usually caused by odor-producing buildup in the washer, a drain connection, or the plumbing—not by a food ingredient. This practical cleaning routine checks the likely sources, cleans the parts you can safely reach, and explains when the smell points to a plumbing or appliance problem instead.

Ingredients

1/2 cup (120 ml) unscented chlorine bleach, for a bleach-safe washer only
1 teaspoon (5 ml) mild dish soap
1 quart (950 ml) warm water
2 clean microfiber cloths
1 old, soft toothbrush or small nylon brush
1 pair of household cleaning gloves

Instructions

Check the smell before cleaning. Turn off the washer and sniff near the empty drum, detergent drawer, and drain standpipe without leaning into the pipe. If the odor is strongest at a sink or several drains, or persists when the washer is off, it may be a household drain or sewer-gas issue rather than washer residue. Ventilate the room. If the smell is strong, causes irritation, or continues throughout the home, leave the area and contact a plumber or building professional.
Read the washer manual and check the drain setup. Confirm whether the manufacturer permits chlorine bleach and whether the model has a cleaning cycle. Do not use bleach if the manual prohibits it. Check that the drain hose is not kinked or pushed too far into the standpipe; it should be installed at the height and depth specified in the manual. A poorly installed or sealed drain connection can let sewer odors escape. Do not remove plumbing caps or dismantle the drain.
Clean the detergent drawer and accessible seals. Put on gloves. Remove the dispenser drawer if the manual says it is removable. Mix the dish soap with the warm water, then scrub the drawer and its housing with the brush. Wipe away loosened residue with a damp cloth. For a front-loader, gently pull back the door gasket and wipe accessible folds, checking for trapped lint or residue. Do not stretch or remove the seal. Use a clean damp cloth to remove soap, then dry the parts.
Run a washer-cleaning cycle. Make sure the drum is empty. Add 1/2 cup (120 ml) of bleach to the dispenser compartment marked for liquid bleach, or use the location and amount specified by the washer manual if it differs. Select the manufacturer’s Tub Clean or Washer Clean cycle. If your washer has no cleaning cycle, use the hottest, longest empty cycle permitted by its manual. Never mix bleach with vinegar, ammonia, descalers, or any other cleaner; toxic gases can result. Keep children and pets away during the cycle and ventilate the room.
Wipe and air-dry. When the cycle ends, wipe the drum rim, door glass, and accessible gasket with a clean damp cloth, then dry them. Leave the door and detergent drawer ajar to air-dry if the washer’s placement and household safety allow. If the machine has a manufacturer-designed pump filter, consult the manual before cleaning it; unplug the washer if the manual requires this, and prepare for water to spill. Never open an unfamiliar filter or service panel.
Reassess after one complete cycle. If the odor remains, do not keep adding cleaners or repeat bleach treatments. Run a rinse cycle only if the manual recommends it, then arrange an appliance-service visit or ask a plumber to inspect the drain trap, standpipe, and venting. A persistent sewer-like odor can indicate a dry or faulty plumbing trap, a blocked vent, or a drain installation problem that washer cleaning will not fix.

Tips

Use the manual as the authority. Washer materials and cleaning cycles differ. Some models require a specific washer cleaner instead of bleach; follow the manufacturer’s listed product and dose.
Never combine cleaning products. In particular, bleach and vinegar or ammonia must not be mixed, even in separate steps if residue remains. Rinse and dry parts between any manufacturer-approved products.
Don’t mask the odor. Fragrance beads, extra detergent, and fabric softener can leave more residue. Use the detergent type and dose recommended for your load and water hardness.
Keep routine maintenance simple. After laundry, remove damp items promptly and leave the door and dispenser ajar when safe. Clean the drawer and gasket regularly, especially if you use the washer often.

Serving Suggestions

There is nothing to serve: this is a washer-maintenance routine, not a food recipe. Once the machine is clean and dry, run a small load of ordinary washable laundry as usual. If the smell transfers to clothes or returns during that load, stop using the washer and investigate the drain or appliance before washing more items.

Variations

For a washer that cannot use bleach: Skip the bleach entirely. Use the cleaning product, dose, and cycle specified in the owner’s manual. Do not substitute vinegar, baking soda, or a homemade combination unless the manufacturer explicitly approves it; acids and powders can damage components or react with residue.

For a front-loader: Give extra attention to accessible folds of the door gasket and the detergent drawer, where moisture and residue can collect. Keep the door open only when children, pets, and walkways are not at risk.

For a top-loader: Clean around the lid and dispenser as directed by the manual, and use its Tub Clean cycle if available. Do not climb into the washer or reach beneath an agitator.

Storage and Reheating

This routine has no prepared food to store or reheat. Keep cleaning products in their original, labeled containers, tightly closed and stored as directed on the label, away from children and pets. Do not pour leftover bleach solution into a bottle or mix it with another cleaner; discard it according to the product label and local guidance. Leave the washer open only while it can dry safely, then close it if needed to prevent access or hazards.

Frequently Asked Questions

Why does my washing machine smell like rotten eggs?
The odor can come from residue and moisture in the drum, gasket, or dispenser, but a sewer-like smell may originate in the drain plumbing. Notice where it is strongest and whether it occurs when the washer is off; a plumbing source needs a plumbing inspection, not more detergent.

Can I pour vinegar and baking soda into the washer?
Don’t use that combination as a default fix. It is not a reliable substitute for the cleaning method specified by the washer maker, and vinegar can harm some seals or finishes. Use the approved cleaning cycle and product, and never combine cleaners.

Can I use bleach in every washing machine?
No. Check the owner’s manual first. If bleach is allowed, use only the specified amount and dispenser. Never pour it directly onto a gasket or mix it with vinegar, ammonia, or another cleaner.

Why does the odor come back after cleaning?
There may be residue in a pump filter or inaccessible part, or the drain hose, trap, or vent may be the source. Repeated chemical treatments can cause damage and will not correct faulty plumbing. Have the washer or drain checked if the smell returns promptly.

Is a rotten-egg smell dangerous?
A washer odor alone does not identify its source. If it is strong, present in multiple rooms, or causes symptoms such as eye or breathing irritation, leave the area, ventilate only if you can do so safely, and contact your gas utility or emergency services as appropriate. Do not operate electrical switches near a suspected gas leak.

How often should I clean the washer?
Follow the manufacturer’s schedule; many washers have a reminder or recommended monthly cleaning cycle, but the correct interval varies. Wipe accessible residue as needed, remove wet laundry promptly, and let the drum dry between loads.

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