1. First, remove the trademark on the Mona Lisa faucet switch, and you will see a cross screw. Use a cross screwdriver to unscrew the screw and then remove the faucet switch.

2. Next, spray a neutral detergent on a soft cloth and gently wipe the inside of the faucet and the surface of the pipe.

3. Finally, wipe it with a clean rag a few times to wipe away the scale and detergent inside the faucet and on the surface of the pipe.