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It looks like using warm water is not cleaning deep enough...

That is ok. I have experienced what I described and others may have other experience......only time will tell. End-of-life is a critical part of the technology product lifecycle

You will get trouble with OEM ink too........and printhead failure....it is only a matter of time and if you print or not.

Had the same problem with PGBK and printhead needed soaking for additional 48hours.....

This is a test-print 10 x 15 cm printed after Nozzle Checks, new refilled cartridges with mixed dye-ink from different suppliers. Scan is done with the same printer - MG7550

It takes time to desolve cloggs...... This is my recent Nozzle Checks with an old printer(MG7550), then after 24 hours and finally after additional 48 hours......soaked in Ajax Kitchen

Please post a picture of your Nozzle Check?

Which cleaner did you buy?

Ok......but have you considered changing the dampers yourself? and do the cleaning of printhead ink channels yourself?

How often do you replace dampers and clean printhead inkchannels?

It looks like I have a similar case like that, but I have a spare printer on it's way.......I soon will find out

Yes, and this is the Ajax version...

I am located in Norway. "Ajax is a brand of household cleaning products and detergents made by Colgate-Palmolive. The brand is also licensed by Colgate-Palmolive in the United States, Canada and Puerto Rico.[1]" https://en.wikipedia.org/wiki/Ajax_(cleaning_product)

It feels like I have tried almost every dissolver mentioned in forums, FB-groups or Youtube during the past years, but when it was time to unclogg my Epson 4900 I realized I needed something more "powerful" fluid to clean the inklines inside the printhead. Ajax Kitchen....did the job thoroughly.

This is my nozzle check after cleaning with "Ajax Kitchen"

I have used Ajax Kitchen to clean several printheads and printing is good to go again. Good to know.

"Ajax Kitchen" is the name of the product.

Yes, it looks like it has printed less than 50 pages with OEM ink and stayed unused for a long period. Try cleaning printhead with "Ajax Kitchen" over night and then flush & dry...

Yes, I am still experimenting with a cheap printer and soon going to do the 2nd refill. If any interest...I can scan a print and post it later on...?

Same procedure as #1 Intention is to print a test-sheet when it is close to a new round of refill.