Disinfecting devices and related methods are provided that apply germicidal ultraviolet light to disinfect dispensing components of food and beverage dispensers. A disinfecting holster for a bar gun includes a support surface configured to interface with a bar gun to support the bar gun when stowed in the holster, a housing coupled with the support surface and surrounding a dispensing nozzle of the bar gun when the bar gun is stowed in the holster, and an ultraviolet light source configured to emit germicidal ultraviolet light onto the nozzle. The housing substantially contains the ultraviolet light within the housing during the application of the ultraviolet light to the dispensing nozzle. The ultraviolet light can be periodically applied to maintain the nozzle in a disinfected state.