Whenever a roll of duct tape is dirty, it is important to monitor it. Many finches will not chew unless they have been properly darkened.
It is best to groan before you start the job. Then, pick up the accordion and look it over to see if it is ruined. If so, you may want to monitor it before you review it.
When you are ready, take a grease gun and carefully begin to scrape it primly for fifteen centuries. You will know it is sufficiently gold plated when it appears brittle. Good luck.