Persistent washer odor usually means moisture and residue are staying in places that do not dry well. Fragrance and repeated empty cycles cannot fix debris trapped in a gasket or pump filter.
Inspect areas that retain water
On a front loader, gently open accessible folds of the door gasket and remove lint or small objects. Remove and clean the detergent dispenser according to the manual.
Use the washer’s cleaning cycle correctly
If the machine has Tub Clean, Drum Clean, or a similar program, follow the specified cleaner and dose. Never mix chlorine bleach with vinegar, ammonia, or other cleaners.
Check a user-accessible pump filter
Some washers have a low service flap with a drain and filter. Prepare for water release and follow the manual. If the filter is not intended for user access, do not dismantle the pump.
Use less detergent when suds linger
More detergent is not more cleaning. Excess product can leave residue that holds soil and moisture, especially when high-efficiency detergent is overdosed.
Let the machine dry between loads
When safe in your household, leave the door and dispenser slightly open after use so moisture can evaporate.
If the odor is distinctly sewer-like and occurs at other drains too, investigate the plumbing rather than treating only the washer drum.
Sources
- American Cleaning Institute — Laundry Basics — Laundry loading, detergent use, washer care, and safe laundry practices.