A fluid supply device, a printing device, and a method of cleaning a printing device are disclosed. A fluid supply device includes a main tank, a fluid chamber, a fluid-discharging head, a movable carriage, an expansion mechanism that expands the fluid chamber to draw fluid from the main tank, a suction mechanism, a remaining fluid detection unit, a comparison unit that compares the remaining fluid volume in the main tank with a specified value, and a setting unit that sets a cleaning mode. The expansion mechanism is actuated via a movement of the movable carriage. The setting unit sets a first cleaning mode in which a first amount of fluid is vacuumed from the nozzle or a second cleaning mode in which a second amount of fluid is vacuumed from the nozzle that is less than the first amount. The cleaning mode is selected in response to the amount of fluid remaining in the main tank.