DO NOT use isopropyl alcohol or any liquid to clean the glass. Official Brother USA Support - Product Support Center BROTHER HL-2070N MANUAL PDF 1 of 2 DOCUMENTS Brother HL-2040 Standard Laser Printer - Refurbished User manual Brother MFCL2750DW Monochrome All-in-One The laser glass is a thin piece of glass located on the roof inside the Brother machine where the drum unit is installed.
