I HAVE A 4900 WHICH HAD CLOGGED HEADS. I got your flshing fluid, which cleared them, but I used most of it up, and some of the cartrdges are empty. I could pull some out of one cartridge which is fuller that the others and shift it to the empty ones.
BUT, I am switching to the ink thrift pro inks.
On your page, you say that it can be used as a flush. (because of the cost) ..
I do not use the printer much, can I leave the ink thrift pro in it while it is not used for a few weeks, or do I need to buy more flushing fluid?
I do have 2 sets of cartridges, well almost 2 sets, I messed one up recently.