Brother HL 3070CW - Manual (Page 139)

Routine Maintenance
129
5
b
Pull the paper tray completely out of the printer.
c
Wipe the outside of the printer with a dry, lint-free cloth to remove dust.
d
Remove anything that is stuck inside the paper tray.
e
Wipe the inside of the paper tray with a dry, lint-free cloth to remove dust.