There is a room in the hotel with hot water. How to maintain it?

Constant temperature or ordinary water mixing valve, 1 constant temperature: use a word or a cross to draw some hot water from the left side in the opposite direction and clean the small hole on the nozzle (through a pin). 2 water mixing valve, remove the faucet handle, clean the valve core and clean the nozzle. If you are a plumber or have complete tools, you can do the above operation. If not, please operate carefully and turn off the main switch before carrying out the above maintenance).