This problem seems to have begun when I started using River Styx bulk (water-based, dye) ink, but I don't think the ink is the problem because I read that dye ink has no particles to clog print heads. Cutting to the chase, is there any solution, such as propylene glycol ether (PGE), which will unclog but not ruin the head? If there isn't, I think there should be--research on the subject. Today I got a message from the "Tinteiros" in Portugal, aka Magic Inkjet Flush, who said that by trying to use window cleaner, alcohol, and hot water, as commonly recommended, now their Magic Inkjet Flush won't work. Tinteiros didn't say what Magic Inkjet Flush is made of. Dow Chemical says PGE makes dye ink flow but is not usually recommended for unclogging print heads. What's wrong with using PGE to unclog print heads? Will it work? Has anyone tried it? How does one get it? Keith Cooper at Northlight Images (UK) intimates that PGE may be promising. Wouldn't it be better just to drip some PGE or other magic solution in the print head than to take it apart? Even if you take it apart, the clog may still be in the channels and difficult or impossible to clear without destroying the print head.