You can run
a Power Cleaning using a utility on your Windows or Mac computer.
Note: After
running a Power Cleaning, you must turn off the product and wait at
least 12 hours before running another Power Cleaning.
If the print quality did not improve, turn off the
product and wait at least 12 hours before running another Power
Cleaning.
If the print quality does not improve after running
the Power Cleaning utility multiple times, contact Epson for
support.