The general procedure is:
1. Close the angle valve under the toilet tank (some people call it the "eight-character door");
2. Pour the water out of the toilet tank Put it clean;
3. Remove the snakeskin hose from the water inlet of the water tank;
4. Unscrew the cap clockwise from the bottom of the water inlet of the water tank, and the water inlet valve will It's ready to be taken out of the water tank.
There are various structures of water tanks, so you’d better spend a little money to ask a plumber for help.
Otherwise, it may be dismantled and cleaned, but you won’t be able to install it again!