Digital BW, The Print

Hi - 
I have a C84 that I purchased this past spring, that I've been using
for    MIS UT-EZ inks.  I didn't use the printer for a little over a
month, and I've got clogged nozzles now.  I've been trying to clear
them with MIS's   Cleaning solution, but I've not had any luck.  

I'm curious, how much does it run for Epson to clean the printer head?
 Is it even worth it with a C84?  Should I just replace the printer
with a C86, or even upgrade to an 890?

Has anyone had Epson repair their C84?