I may be the exception but by following the instructions I definitely cleared a hopelessly clogged PGBK port that I had to deep clean just to get enough ink to flow through. The only thing I found was the instructions, while decent by "non-native verified" standards, they didn't provide enough information on how to use the plunger. I've found with the PGBK connector in particular that the plunger doesn't fit well into the connector unless it's in exactly the right position. If not, only squirt the cleaning solution down the well, not through the port. To get more than a trickle through the port, you have to feel a lot of resistance. Not sure if pulling and pushing the plunger does anything other than pump air. I'll make an adjustment if the port clogs again, but for now it prints like a new printhead.
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