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To start with, a replacement printhead can be bought rather cheaply these days, http://amzn.to/2acmQl0
A few years ago you were stuck with purchasing OEM printheads at around 100$. So 25$ for a printhead isnt bad at all.
As far as cleaning, you could t ry removing all the ink tanks, removing the printhead. And then cleaning carefully all the electrical contacts you can see on the printhead with a soft, lint free cloth slightly dampened in a solution of 1 part windex and 3 parts water. ( the wi ndex can be substituted for any ammonia free glass cleaner, or rubbing alochol)
Once cleaned, you could try and insert the printhead and see if its recognized. If not, you will need to replace it. ( And thats most likely the outcome as these printheads were only rated to last a few years and youre past that )
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