Thanks for all the advice, guys.
Any tips on how to actually get the various suggested solvents to the print heads themselves? I've never quite figured out how! Or is it enough to squirt it down the little nozzles that stab into the cartridges?
To those suggesting dumping the Epsons - I hear you, and I agree with the sentiment, but I unfortunately have no control over such decisions. I'll certainly make suggestions, though. I wonder how long a couple of basic colour lasers would take to pay for themselves vs. 8 or so inkjets??
Cheers.