A method for alternately feeding a flushing medium and at least one cleaning medium (24a to 24j) by means of a metering system for at least one laundry cleaning device (2a,...2d), wherein the flushing medium is fed to the metering system via a flushing medium feed line connected to at least one inlet connection (15a, 15b), and the metering system is connected with an outlet connection (22a to 22d) to each laundry cleaning device (2a,...2d) via a respective washing medium feed line (23a to 23d), wherein the following steps are carried out: a) detection of an automated cleaning task or a cleaning task which can be specified by a user, b) checking the pressure in the flushing medium feed line, c) feeding of the flushing medium to the laundry cleaning device (2a,...2d) via the washing medium feed line (23a to 23d) assigned to the laundry cleaning device (2a,...2d), d) feeding of the at least one cleaning medium (24a to 24j) to the laundry cleaning device (2a,...2d) according to step c), e) flushing of the metering system and the washing medium feed line (23a to 23d) with the flushing medium for a predefinable period of time, wherein each inlet connection (15a, 15b) has an inlet valve and each outlet connection (22a to 22d) has an outlet valve, wherein, depending on the result of the check in step b), at least one inlet valve and the outlet valve assigned to the laundry cleaning device (2a,...2d) according to step c) are opened before step c) is carried out, wherein a cleaning medium valve assigned to the respective cleaning medium (24a to 24j) is opened for a predefinable period of time after or during step c), and the opened cleaning medium valve is closed again before step e), wherein the flushing according to step e) is ended in a step f) taking place after step e) by closing the respective outlet valve and/or the inlet valves, wherein different cleaning media (24a to 24j) can be fed separated from one another, in that steps d) to e) are again repeated in an iteration following step e), wherein the metering system for alternately feeding the flushing medium and the at least one cleaning medium (24a to 24j) comprises an inlet distribution channel connected to the respective inlet connection (15a, 15b) and an outlet distribution channel connected to the respective outlet connection (22a to 22d), and the inlet distribution channel is thus connected to the flushing medium feed line, wherein the at least one cleaning medium (24a to 24j) can be introduced into the inlet distribution channel in each case via a cleaning medium feed line (8a to 8p) connected to the inlet distribution channel, and the outlet distribution channel is connected to the at least one washing medium feed line (23a to 23d), wherein the inlet distribution channel is connected to the outlet distribution channel via at least one pump (3a, 3b, 4a, 4b), preferably via two pumps (3a, 3b, 4a, 4b), wherein the outlet distribution channel is connected to the flushing medium feed line via a second inlet connection. a) detection of an automated cleaning task or a cleaning task which can be specified by a user, b) checking the pressure in the flushing medium feed line, c) feeding of the flushing medium to the laundry cleaning device (2a,...2d) via the washing medium feed line (23a to 23d) assigned to the laundry cleaning device (2a,...2d), d) feeding of the at least one cleaning medium (24a to 24j) to the laundry cleaning device (2a,...2d) according to step c), e) flushing of the metering system and the washing medium feed line (23a to 23d) with the flushing medium for a predefinable period of time,