I almost put my Epson Stylus DX4450 to the dump: there was apparently no way to clean the heads. But taken of a doubt, I made again a latest research on the net and I found this. Formidable efficiency. My printer working again as in the early days. While it was necessary to conduct several times cleaning protocols and verification of heads, to reboot the system correctly, which is ink consumers certainly, I'm still winning on the cost of the operation and ... Earth planet too !!!