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acetone will dissolve most clogs. TOO MUCH ACETONE will destroy your printer
follow my suggestion at your own risk, but i have had fairly good results with this method
easiest way is to use a flush chemical and add 15-20% acetone to it.
saturate the felts in the captop and pinch off the drain line. (fill to the point where the liquid is contacting the head.)
the other chemicals in the flush mixture will keep the ink from setting like cement, when the acetone dissolves.
so, let the mixture stay in contact with the head for at least an hour, perhaps as long as overnight.
after doing this, i would take a syringe and flush the hell out of the captop and run a couple cleaning cycles (at least 3.)
alternate cleaning cycle and test print with perhaps another shot of flush NO ACETONE.
you should see quite an improvement in the test print, getting better if you repeat
keep in mind:ONE TIME i overdid the acetone and didn't hurt anything else, but, the next day i had a cleaning pump frozen. i imagine i solvent welded the impeller inside the pump. So keep in mind how important flushing the acetone out, after your soaking is.