Junking out various cupboards I've found hoards of daughters' old pens. Some work and I put them on my desk at work for the theiving scrotes we employ to take. It's recycling of a sort.
Some don't write but can be revived, by placing in hot water, but not for long. Is there a solvent that might work better, possibly syringed into the ink tube? I know it can't be worth the effort but I'm turning into my dad at an accelerating rate.
AJH