So I have some vintage pens...
A few are in writing shape; I think my Esterbrook would still write if I put ink in it right now; anyway, they all need a cleaning. I've searched office supply shops and stationers for pen cleaner but it as yet eludes me. My girlfriend tells me to use plain rubbing alcohol but I'm honestly worried I might damage the workings of the pens as while they might not hold great monitary value (The Sheaffer's seems downright cheap!) they are of great sentimental value because they were my grandmother's. So what should I use to clean a pen? One was in use until a couple years ago and the others have all been out of service for anywhere from probably at least two decades (The Parker 51 and Sheaffer's) to probably the better part of a century (The Parker Duofold and the no-name gaudy pen). How do I clean these?
Also, I have two bottles of ink (for the pens that require it; the Shaeffer's is a cartridge fill and Shaeffer cartridges are readily available and I have some on hand). One is Sheaffer "Skrip" ink, the other is Waterman. Is one clearly superior to the other? Both are pretty old, but I used to use the Waterman in high school so as of about 5 years ago it was writing well. The Sheaffer ink is what would be described as "New Old Stock", forgotten in a desk drawer decades ago. So does ink go wrong, and if so how long does it take to do so? Should I fill these pens with ink on hand (I might be able to turn up some Parker ink as well) or procure new ink, and in either case is there a clear prefference?
So now on to the hard question... Two of the pens are in non-writing shape: The Duofold (I believe it to be a 1928 model, it is fat and black like the orriginal red Duofolds and AFAIK black was only available in 1928 and they changed after that) is in poor shape; the plunger under the end cap has a bad feel to it; judging by diagrams I have seen of these pens I'd say the little rubber diaphraghm is probably done for (no surprise after 80 years!). I have no idea if it writes; I can get the tip out with some difficulty (it doesn't have threads, it's fritction fit VERY tightly) and could in theory fill it with ink with a syringe or similar instrument and see if it will write, but that'd be useless until I clean it... Also there is no breather tube attached to the tip as shown in the diagram but I'm not sure of the assembly exactly so it may be as it's supposed to be.
The "no-name pen" is an average sized pen; its cross-section would form a decagon; it is a lever fill and the clip, lever, and cap decoration are all gold. The only markings are on the clip (PAT'D) and the nib ("WARRANTED" and "14K" although if it was ever gold in color or actual material it's now horribly black and tarnished). The plastic it's made of has a marbled appearance of black and white-grey (The white-grey elements almost wanting to be mother-of-pearl) with red highlights. This pen's ink bladder went hard ages ago and crumbled to dust inside the barrel. Can it be saved or is it even worth saving?