Epson Expression Photo XP-8700 Wireless All-in One Color Printer - Manual (Page 258)

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You see a window like this:
5. Select Power Cleaning and click Next .
6. Follow the on-screen instructions to run a Power Cleaning.
7. When the Power Cleaning is finished, click Print Nozzle Check Pattern and follow the on-screen
instructions to print a nozzle check pattern.
If the print quality did not improve, you must turn off the product and wait at least 12 hours before printing
a nozzle check pattern and running another Power Cleaning or Print Head Cleaning.
If the print quality does not improve after running the Power Cleaning utility multiple times, contact Epson
for support.