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If you have already used all of the built-in utilities to run a clean of the print head several times then the only other option left is to try manually cleaning the print head tubes and jets by disassembling it and using an alcohol solution; or you could try replacing the print head.
After 5 years it is very likely that the print head has worn out and is starting to leak ink, even if it is not used regularly.
Replacing the print head can be a costly procedure, so you may just want to invest the money in a new printer instead - you can get one for under £30:
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