You can run
a Power Cleaning using the control panel on your product.
Note: After a
Power Cleaning, you must 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.