The tub clean cycle is a feature in LG washing machines that helps keep the washer in optimal performance by removing detergent buildup and other residue, which can cause odors and affect the machines performance. To use the tub clean feature, you will need to purchase a tub cleaning product, which can be in the form of a liquid, powder, or tablet. The cleaning product should be added to the main wash compartment in the dispenser, or directly into the drum, depending on the type of product. After adding the cleaning product, select the tub clean cycle, close the dispenser drawer and the washer door, and press start. When the cycle is complete, open the door and the detergent dispenser to ventilate and dry any moisture remaining inside the washer. It is recommended to clean the tub on a monthly basis to help minimize the possibility of odors and detergent residue buildup, and to maximize the machines performance.