Two full black ink cartridges are not solving my problem of not being able to print black with my Epson Stylus C60. Color works beautifully when black is not necessary. I've read about some nozzle cleaner stuff, but since it isn't widespread, I didn't simply jump to buy it. Is there anything I can do to fix the problem? It is related to the printer, I believe a nozzle is clogged (possibly). Nozzle cleaning is not helping.