Method for repeatedly feeding a cleansing liquid into a device for spraying a cleansing liquid into an enclosure closable by a rotatable lid, said method comprising the steps of a. providing a spraying system, said spraying system comprising the device for spraying a liquid into the enclosure closable by the rotatable lid and a cartridge system for the device for spraying the enclosure that is closable with the rotatable lid; said system comprising a cartridge having a reservoir opening into a neck having an outlet opening, and a cap for said cartridge; wherein the cap is suitable for closing off the neck, and wherein the cap comprises a cover area and a collection trough extending from the cover area on the inward side of the cap; wherein at least a side-wall portion of the collection trough is integral with the cover area and wherein the cover area comprises a liquid outlet orifice positioned close to the bottom of the collection trough; wherein the cap is receivable by the outlet opening of the cartridge; wherein the cartridge system is receivable by the spraying device; wherein the cartridge is attached to the device and wherein the cartridge comprises the cleansing liquid; b. bringing the device and the cartridge in an orientation wherein cleansing liquid can flow from the reservoir into the neck; c. rotating the device and the cartridge from that orientation to an orientation wherein the side-walls of the collection trough are in an upward direction with respect to the bottom of the trough, such that a portion of the cleansing liquid is collected in the trough; d. emptying said portion of cleansing liquid into the liquid spraying mechanism of the spraying device via the outlet orifice; and e. optionally repeating steps b to d. a. providing a spraying system, said spraying system comprising the device for spraying a liquid into the enclosure closable by the rotatable lid and a cartridge system for the device for spraying the enclosure that is closable with the rotatable lid; said system comprising a cartridge having a reservoir opening into a neck having an outlet opening, and a cap for said cartridge; wherein the cap is suitable for closing off the neck, and wherein the cap comprises a cover area and a collection trough extending from the cover area on the inward side of the cap; wherein at least a side-wall portion of the collection trough is integral with the cover area and wherein the cover area comprises a liquid outlet orifice positioned close to the bottom of the collection trough; wherein the cap is receivable by the outlet opening of the cartridge; wherein the cartridge system is receivable by the spraying device; wherein the cartridge is attached to the device and wherein the cartridge comprises the cleansing liquid; b. bringing the device and the cartridge in an orientation wherein cleansing liquid can flow from the reservoir into the neck; c. rotating the device and the cartridge from that orientation to an orientation wherein the side-walls of the collection trough are in an upward direction with respect to the bottom of the trough, such that a portion of the cleansing liquid is collected in the trough; d. emptying said portion of cleansing liquid into the liquid spraying mechanism of the spraying device via the outlet orifice; and e. optionally repeating steps b to d.