Brother HL-7050N - Manual (Page 161)

5 - 12 ROUTINE MAINTENANCE
HL7050_US_UG_FM5.5
Cleaning
Clean the outside and inside of the printer with a dry soft cloth.
When you replace the drum unit, make sure you clean the inside of
the printer. If printed pages are stained with toner, clean the inside
of the printer with a dry soft cloth.
Cleaning the outside of the printer
Clean the outside of the printer as follows:
1 Turn off the printer power switch, and then unplug the printer
power cord.
2 Pull the paper tray out of the printer.
3 Open the multi-purpose tray.