How to clean dirty water tank and clean water tank?

1. Take out the dirty water tank,pour out the dirty water. (If dirt remains at the bottom of the tank, you can use a cleaning brush to assist in cleaning it thoroughly.), close the tank.
2.Take out the water tank, If there is dirt water inside, clean up, close the tank.
Note: After the dirty water tank is cleaned, the top cover of the water tank must be tightly closed.