It is generally a good practice to leave the door or cover of your washer and dryer open after each use to allow them to air out. This helps to prevent the growth of mold, mildew, and unpleasant odors that can occur due to the moist environment inside the machines.
When you finish using the washer, leave the door open for a while to allow the interior to dry out. This helps to prevent the buildup of moisture, which can lead to mold and mildew growth. Similarly, for a dryer, leave the door or cover open to allow any residual moisture to evaporate.
By providing proper ventilation and airflow, you can reduce the likelihood of unpleasant smells and maintain a fresher and cleaner environment inside your washer and dryer. However, if you have pets or small children, ensure that leaving the washer or dryer door open doesn't pose any safety hazards.