Deskjet 612C clog?

I think that my jets may be clogged, I get all the colors once in awhile, the black all the time, and when it does print the colors are streaking. Mostly though it will not print colors 90\% of the time. I tried cleaning from toolbox, and online troubleshooting with HP did not help. Any sugguestions, I read that Epson being soaked in windex cleaned the color pad, and fixed that problem........