Our Canon is about 5 years old & it'll be around for a while. Unfortunately, during the 3 month summer break, I had no reason to print any color documents & all the color heads clogged. Yes, I know now I should have run a color doc at least every couple weeks. So in the future, anyone that has a inkjet printer, be sure to run a color doc once in a while. It still prints good b/w docs, that's all we need for now.
BTW, I went so far as to try soaking the printing part of the head in alcohol for a few hours...no good.