I have a Canon Pro-100 inkjet printer that I haven't used in about a year. After cleaning the heads with the Canon printer maintenance software 2, the print heads would not open. Checked the internet and found this to be the top rated product. I filled a small tub with about 1/2-1/2 inch of product and let it sit overnight. The liquid filled with ink so I did it again. Filled with ink color again. Drain again and fill the tub with distilled water and let it sit, did this twice. Last bath again with product. I left it in the sun for about an hour and put it in the printer with new ink. Printhead checked, everything works. Some have asked what are the ingredients? It's not on the list, but smells strongly of ammonia. Bottom line, it worked 100% and after I ordered it, I bought new printheads for $500. I was looking for new printers. You cannot get new printers. Most have been discontinued. If that didn't work, I was stuck in traffic. Saying for the wise: use an inkjet printer at least once a month. "Alexa, remind me to use the printer."
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