1. Before removing the shower switch, we must first close the main water valve, then pry off the decorative cap of the handle, and then loosen the screws to easily remove the fingerprint. Generally speaking, it can be removed by turning it twice (put the screws out during the removal process to avoid losing them).

2. To twist off the decorative cover, this step requires a little effort, and then you can remove the gland nut; the part exposed after removal is the valve core, which is the key part of the shower switch; after removing it, you can rinse the inside to remove impurities.

3. After cleaning the shower faucet and ensuring that there is no impurity on the surface, we can replace the new valve core and align the hole accurately; after the shower faucet is fixed, the gland nut can be installed and the valve core can be turned clockwise until it cannot move.

4. Install the handle according to the hot water outlet position of the shower faucet, tighten the screws, and press the decorative cap.