Hutt W8 Manual Del Usuario página 5

Hold the machine in your hand and turn it over with the bottom
suction inlet upwards, start the machine， then press and hold
the power button, the crawler wheels will rotate slowly, then
use a wet tissue to wipe off the dirt on the crawler wheels.
Remove the plug of the water tank, fill an appropriate amount
of pure water or glass cleaner , and then tighten the water tank
plug.
※The filling content must be non-corrosive liquid. For example:distilled
water,special glass water,pure water, etc. It is recommended to use
distilled water or special glass water for a better cleaning result.
※It is forbidden to fill corrosive liquid into the water tank.