Remote printer head cleaning

[David Fletcher]

I've got a networked Hewlett Packard Deskjet 1220C connected via a 
Netgear Ethernet - USB print server. Jobs are submitted as postscript 
to a server running CUPS on Ubuntu Dapper Server.

Does anybody know if it's possible to command the printer to do a 
head cleaning cycle?

How?

I know how to do it with my Epson that's connected to the USB port on 
the machine, but I've no idea about this one.

Thanks

Dave