Never put wax, oil or floor maintenance products that cannot be diluted in the clean water tank, or let the appliance pick them up to prevent damage. Do not put acetic acid (vinegar) or descaler products in the clean water tank, or let the appliance pick them up.
If you want to use a liquid floor cleaner, first fill the clean water tank with water. Then add the quantity of liquid floor cleaner indicated on the bottle. As the clean water tank has a capacity of 700 ml, you only have to add a few drops.