LG · Laundry · WM4000HBA · Owner's Manual
Run Tub Clean monthly. Run it more often if the washer is used heavily or if odor is already present. If mildew or a musty smell already exists, run it once a week for three consecutive weeks.
Source: LG WM4000HBA Owner's Manual, extracted pages 37-38
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Cleaning the Washer Exterior and Door
Keeping the outside of the washer and the door clean helps protect the finish and reduce moisture and odor.
Safety first - Unplug the appliance before cleaning to avoid the risk of electric shock. - Do not spray water inside the washer. This may cause fire or electric shock. - Do not use volatile substances such as benzene, paint thinner, alcohol, or acetone, and do not use abrasive cleaners or detergents with strong chemical components. These can discolor or damage the appliance, or may cause a fire. - Do not touch the surface or the display with sharp objects.
LG WM4000HBA Owner's Manual, extracted pages 37-38Troubleshooting Laundry Results, Odors, and Wi‑Fi
Use the suggestions below when clothes are wrinkled, stained, smell musty, or when the washer will not connect to Wi‑Fi.
Wrinkling
LG WM4000HBA Owner's Manual, extracted pages 49-50This answer is only published when it has a reviewed answer status and a source citation back to the manual text.