With the Dreame L40 Ultra AE, the small black container is intended exclusively for cleaning agents for mop cleaning in the station, not for direct floor cleaning. The detergent supplied is only for cleaning the mop pads. When it is empty, you must not fill it with any household or floor cleaning agent, as there is a risk of foaming, pump or seal damage. An official refill specifically labelled "L40 Ultra AE" does not currently exist, AWH6 is actually not approved for the L40 series. Low-foaming cleaning agents suitable for robot hoovers that are explicitly declared as Dreame-compatible (original or compatible alternatives) are permitted. The system primarily uses the solution for pad washing in the dock; clear water is predominantly used during mopping.