What should I do if there is an error message telling me that specks of debris are affecting performance?

To clean the scanner glass and white plastic backing, switch off the printer and unplug it. Open the scanner lid and use a soft cloth or sponge moistened with nonabrasive cleaner to wipe the surfaces. Ensure you use a dry chamois or cellulose sponge to prevent spotting after cleaning thoroughly. Plug in and power on the product afterward. (Page 10)