https://community.usa.canon.com/t5/Office-Printers/Repeated-cleaning-required-for-GX4020-printer-heads/m-p/570564#M29890 <P>I have a Canon GX4020 (ink tanks rather than cartridges) which I bought about 18 months ago. I've printed about 33K pages. For the last several months, the color has been going awry frequently. I clean the nozzles and it looks OK, but within a week or two (under 1000 pages, the majority B&amp;W and all document printing) the color is off again. I've tried deep cleaning, and it doesn't seem to last notably longer than a regular cleaning. In fact, after doing a deep cleaning just now, I'm still seeing some magenta in the first yellow band of the nozzle check pattern page.</P><P>Any suggestions for getting the nozzles clean enough that they stay clean for an extended time?</P> Wed, 08 Oct 2025 00:31:20 GMT ElrondPA 2025-10-08T00:31:20Z https://community.usa.canon.com/t5/Office-Printers/Repeated-cleaning-required-for-GX4020-printer-heads/m-p/570564#M29890 <P>I have a Canon GX4020 (ink tanks rather than cartridges) which I bought about 18 months ago. I've printed about 33K pages. For the last several months, the color has been going awry frequently. I clean the nozzles and it looks OK, but within a week or two (under 1000 pages, the majority B&amp;W and all document printing) the color is off again. I've tried deep cleaning, and it doesn't seem to last notably longer than a regular cleaning. In fact, after doing a deep cleaning just now, I'm still seeing some magenta in the first yellow band of the nozzle check pattern page.</P><P>Any suggestions for getting the nozzles clean enough that they stay clean for an extended time?</P> Wed, 08 Oct 2025 00:31:20 GMT https://community.usa.canon.com/t5/Office-Printers/Repeated-cleaning-required-for-GX4020-printer-heads/m-p/570564#M29890 ElrondPA 2025-10-08T00:31:20Z