I have searched our documentation and knowledgebase and I cannot find any steps on how to clean the transfer belt for that device so I am not sure if it is something that you are able to do on your own. I would recommend contacting the Support Department and they may be able to walk you through the steps or schedule a service engineer to contact you.
Thanks, CathyO-Xerox Community Manager
Be sure to click Kudos for those who have helped you. Select Accept as Solution for posts that have helped to solve your issue(s)!