Canon imagePROGRAF iPF750 MFP M40 - Manual (Page 775)

3.
Using a damp cloth that you have wrung out completely, wipe inside the Top Cover to clean it. Wipe away any ink
residue on the Platen as a whole (a), the Paper Retainer (b), Borderless Printing Ink Grooves (c), and Ejection
Guide (d).
Maintenance and Consumables > Cleaning the Printer >
iPF750 Cleaning Inside the Top Cover
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