Hi, I would like to advise me, I have two ink cartridges with cartridges, (it is not continuous ink) but I uncover them to wash them as they were with the dry ink already covered and 4 cartridges already had the sponge undone and I have to replace it , my question is what kind of sponge I have to use, I do not know if it is foam and what density, the cartridges are HP and Canon, Thanks for your support :)

I advise you to buy other cartridges or get other cartridges that you do not recognize and wash with sponge water that should be fine with dried paper that adsorbs the moistened and let dry in the air and sun and you replace what you lack in your cartridges that you are recovering.