An embodiment provides a device for cleaning a sleeve of an ultraviolet light source, including: the ultraviolet light source for the disinfection of a fluid, wherein the sleeve surrounds the ultraviolet light source; a cleaning composition encapsulated in a polymer material to form a compound; a canister around and in contact with the sleeve and encapsulating the compound against the sleeve thereby placing the compound in a location adjacent to the sleeve, wherein the polymer material dissolves at a pH above a target value above the polymer material dissolution point releases the cleaning composition. Other aspects are described and claimed.