1. Place the nebulizer on a flat surface, press the center of the cotton cap with your fingers, and then slowly pull out the cap with your other hand;
2. Use a pointed tool, such as a needle or a small pair of scissors, to slowly pull the cap out of the nebulizer;
3. Use a cotton swab or a gauze cloth to pull out the cotton cap, and then pull out the cotton cap with your other hand slowly cotton cap;
4. Use a cotton swab or gauze to pull the cotton cap out, and then slowly pull the cotton cap out by hand.