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Originally Posted by flat5
Certainly not an approved method but it works for my HP 720c:
remove cartridge
run a little hot water over the ink area
clean & dry with toilet paper
when everything is dry, install cartridge
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I use a slightly different method than this one. I wet a paper towel with slightly warm water then hold it on the cartridge for a couple of min. When I start to see colors, I hold a dry paper towel on the same spot for another couple of minutes. It has worked everytime.