Your mother is partially correct. Leaving the washing machine door open after completing a wash cycle can help prevent the growth of mold and mildew inside the machine. When the door is closed, moisture can accumulate, creating a damp environment that is conducive to mold and mildew growth. By leaving the door open, you allow air to circulate inside the machine, which helps to dry out any remaining moisture and inhibit mold growth.
However, it's important to note that leaving the washing machine door open doesn't guarantee complete prevention of mold. Other factors, such as the humidity level in your laundry area and the cleanliness of the machine, can also contribute to mold growth. It's a good practice to regularly clean the machine and its components, such as the detergent dispenser and rubber gasket, to remove any residue that may promote mold growth.
Additionally, if you live in a particularly humid or damp environment, or if you notice persistent mold or mildew issues despite leaving the door open, you may want to consider using a washing machine cleaner or a dehumidifier to further prevent mold growth and maintain a clean and fresh machine.