21-hole is upgrade model, due to the increase in the number of bubbles, the distance between the holes is denser, and the bubbles are more likely to stick together. This is a normal phenomenon. If you encounter bubbles sticking together, only need to disassemble the muzzle, rinse and wipe it dry. It is recommended to spray it horizontally or downwards once or twice after dipping the bubble liquid, which can prevent the liquid from wetting the fan and reduce the appearance of bubble adhesion.
