SWIP150

"To remove scale deposits that build up inside the water tank, add one or two tablespoons of white vinegar to the tank full of water, close the tank lid, and then shake the tank. DO NOT SPRAY STEAM.
Cleaning procedure to remove scale
If your steam mop begins to produce less steam than usual or no steam at all, you may need to remove the scale that deposits on the metal parts over time and significantly affects the performance of the unit.
It is necessary to remove the scale about every 25-50 tankfuls or at least once a month, especially in areas with hard city water. "