The LG washing machine door gasket is a very flexible ring of rubber that is mounted on the washing machine to seal the door tightly. The gasket should be wiped dry after every load of laundry. Mildew and mold can grow behind this flexible gasket; look behind the gasket for buildup. Clean the interior of the gasket with 1/4 cup bleach mixed with a gallon of water and a sponge. Leave the door open for one to two hours.
You must use the manual drain hose and pump on a regular basis to remove standing water from the LG washing machine; it will not completely drain on its own. Stagnant water can have a terrible smell that can permeate your laundered clothes. Empty the drain hose into a bucket, and remove the drain pump filter. Scrub off any buildup, pat the filter dry and replace it in the pump.
A special detergent called high-efficiency detergent is made specifically for use with front-loading washing machines. It prevents detergent residue from being left behind on the washtub as the washing machine drains. The detergent residue can have a very strong, unpleasant smell that may dissipate somewhat if you leave the washing machine's door open for one to two hours. If the machine continues to smell, you can quickly clean the washtub with front-loader cleaner and a sponge.
Tub Clean Cycle
The "Tub Clean" cycle is meant to remove any detergent residue left in the LG washing machine. This detergent buildup can start to smell, and the smell cannot be removed with typical household cleaners. Unless the LG owner's manual tells you to do so, do not use household cleaners on your washing machine. Run the "Tub Clean" cycle on a regular basis before the detergent buildup hardens and begins to smell.