Digital BW, The Print

can anyone help me? i just got a new set of PiezographyBW carts for my Epson
1200 and hadn't used it in quite some time. as a result i've got a clog that
i just can't bust. i've tried everything that i've read on this list, i.e.:
several cleaning cycles (enough to use half the ink in the carts!), letting
it sit overnight (twice) with windex on the parking pad, running the print
head along a windex soaked, lint free cloth, letting it sit overnight on the
cloth soaked in windex...and nothing seems to clear it.
does anyone have any other suggestions that might help?

much appreciated

Frank Vena