The cleaning schedule and procedures are avalable as printable stickers here:
ftp://ftp.mutoh.com/Printer%20Information_Manuals/VJ-1204/Maintenance%20Information/Technical%20Information%20Bulletins/ValueJet%201204%20Maintenance.pdf
ftp://ftp.mutoh.com/Printer%20Information_Manuals/VJ-1304/Maintenance%20Information/Technical%20Information%20Bulletins/VJ-1304 printer sticker_flat.tif