If you have a Diesel Nozzle/Pop Tester and are doing the work yourself cleaing the Nozzles is practical and one of the reasons to have a Nozzle/Pop Tester.

Because the Injector Nozzles often do not all wear at the same rate you are paying someone to do the Cleaning and the overall cost effectiveness for long term use could favor new Nozzles.

If you have a bunch of used Injectors If you have a Nozzle/Pop tester and the Ultrasonic Tank you can maybe find enough to make a good set.

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84 300D, 82 Volvo 244Gl Diesel