Remove the water tank cover.

Empty the water tank.
Hold the water tank with both hands and pull it up.

Remove the water valve a in the water tank by turning it clockwise.

Clean the water tank and the water valve in running water. Wipe the inside and outside of the water tank and the fridge door with a clean cloth.
Mount the water tank in the reverse order of the removal process.
Clean water tanks if they have not been used for 48 hours.