I had problems with red and black on my 7710, even though I use these colors every day to print invoices. Red didn't pass at all, and there were gaps in black. I've used this product 2 or 3 times on these flowers and it cleaned them up pretty well. Once they started to work better, the other two colors started having problems. I took them all back off and cleaned up the other colors and they all work fine now. There is still enough product in the bottle to clean it a few more times. The rubber tubing on the syringe fits snugly into the printer so there were no leaks when cleaning. I was positively surprised. The instructions are clear, this wasn't a messy project and it worked as intended for me. Worth a try.
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