iRobot Roomba 205 DustCompactor Owner's Manual page 16

Cleaning the water tank (Combo models only)
1
Simultaneously press and hold both the release buttons of the water tank, and
EN
then slide it out from the bottom of the vacuum-mop as illustrated.
2
Empty old water, rinse with fresh water.
3
Dry exterior of the tank well before reinstalling into robot
NOTE: If you use detergent to clean the tank, only use dish soap and
be sure to rinse thoroughly before using in robot again. Soap can
damage the robot during operation
NOTE: After mopping, immediately remove the water tank, empty
out any remaining water, and clean and dry the mop pad to prevent
lingering odor and mildew.
16 For more information, visit global.irobot.com
Cleaning the mopping pad
Thoroughly hand wash the mopping pad with cold water and let it air dry.