Clean the platen (and media path) whenever the printer has significantly poorer performance, print quality, or media handling. The platen is the print surface and drive-roller for your media. If sticking or jamming continues even after cleaning, you must replace the platen.
Contaminants on the platen roller can damage the printhead or cause the media to slip or stick when printing. Adhesive, dirt, general dust, oils, and other contaminants should be cleaned off the platen immediately.
Clean the platen with a fiber-free swab (such as a Texpad swab) or a lint-free, clean, damp cloth very lightly moistened with isopropyl alcohol (minimum 99.7% pure).