I had 2 different Brother Ink Jet Printers that had plenty of cartridges, but the GoodWill had stored them for some time, did the Brother Clean Method. but still had lots of “crud” worthless, so nothing to lose.
found a pipeete - several old clean grease rags, removed the cartridges, placed the grease rags under the opening, and into where the cartridges went. with pipette forced/skirted alcohol into openings, all four, and flushed out, this also will help clean the head area. after 4 time flushing. cleaned mess, inserted the Cartridges back, did the clean and check replacement cartridges, ea succession of test was better. did the remove and pippette alochol again, 3 times,
this time on insert cartridges, and test, it was almost perfect…. any way good enough the GoodWill was able to Sell for a nice profit… I did my work FREE.