all these DEF injector hoopla got me paranoid so at around 30+k miles, i was changing my fuel filter & decided to take a look at my DEF injector since i was already down there. at 30+k miles using 90% Walmart DEF, 10% truck stop DEF my injectors look like this
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steam cleaned it & also used a soft toothbrush, then reinstalled.
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I'm at almost 60k miles now, no plans of going in there again until after 100k, or if warning pops.
wear eye protection, you will get DEF crumbs, dirt & water spray on your face & eyes.