Digital BW, The Print

Hate to bring this up yet again, but I just set up a brand new 1280, MIS
CFS with MIS VM inks, and I've got clogged nozzles. Everything was
beautiful for the first week, then I didn't print for a week, now I can't
get it unclogged. I've done  4-5 iterations of the three-nozzle-
cleanings-then-print-purge-pattern routine, with no luck.

So, what's the current wisdom on 1) fixing and 2) preventing this? I'm
reluctant to start the whole windex routine; I did that for two years
with my 1200 and ended up replacing the printhead, twice.

PS: the prints with this system (pre-clog) (using Roark curves) are
beautiful. I JUST WANT TO START PRINTING!!

Harry