MFC-9450CDN FAQs & Troubleshooting MFC-9450CDN Not your product? Sort by: Updated Date Popularity 4 Results 1. 01/29/2014 How do I clean the drum unit? 2. 08/22/2007 How do I clean the laser scanner windows? 3. 03/30/2007 How do I clean the scanner to improve the copy or fax quality? 4. 03/29/2007 How do I clean the corona wires? Cleaning FAQs & Troubleshooting