There are several problems that can cause your washing machine to smell like rotten eggs, such as bacteria, mold, detergent buildup, some stagnant water, draining issues, and other plumbing problems. This smell can usually be noticed when the washing machine door is opened, when the washing machine is in use, or when the wet clothes in the washing machine are left for too long.
If your washer smells like rotten eggs, there may be something as simple as a dirty gasket or filter. However, a strong washing machine bad smell could also indicate problems with the drain or sewer gases. The most common washer odor causes are mold, lint, soap, buildup, dirty drain parts, and poor washer ventilation.
Homeowners can often manage odors by using a hot cleaning cycle, cleaning the seals and filters, and better laundry practices. If odors persist, it's a good idea to call Universal Appliance Repair for professional help.