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I would suggest to use the Printer/Copier Cleaner Sheets. Those are usually quite effective on removing dust, debris, and paper particles that could be causing the jams. Keep in mind that could be also one of the rollers going bad on that printer that could be causing these issues.
Here are some links that will help you solve this matter:
- Printer/Copier Cleaning Sheets: http://www.amazon.com/dp/B008EXK6E0/ref=wl_it_dp_o_pC_S_ttl?_encoding=UTF8&colid=3ULKRMW6NGAQ7&coliid=IKT6RHCN8NZAY
- How to properly and Safely remove paper jams walk-through: http://www.manualslib.com/manual/275608/Canon-Imageclass-Mf6540.html?page=205#manual
- Canon's Tech-Support just in case if the Cleaning Sheets don't do the job: https://www.usa.canon.com/internet/portal/us/home/support/details/printers/support-laser-printers-imageclass/imageclass-mf6540