Basically in addition to spraying all the injector parts with Super Lubricant (for those who don't know you can get this at Pep Boys) I took each nozzle, removed the pintle and then wiped the outer bottom of the nozzle and the tip of the pintle with a soaked paper towel until I was no longer getting any carbon on it, then sprayed it some more to get rid off any lint. You can really get a lot of carbon off the nozzles this way (something that Diesel Purge won't do sufficiently) and it does make a big difference in the nozzle's performance. I suppose you could do this without disassembling the injector, but the tip of the pintle will be in the way and you may not be able to clean it completely. I needed to disassemble the injectors anyway for balancing.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL