Brown Stain Obscuring my Demonstrator

[Lenny77]

yazeh, in this case it was an ink that I used, didn't work properly and stained my pen. However, I get your meaning, and thank you...

 

I will add, I was cleaning a converter on another pen and ink had seeped behind the plunger and wouldn't come out. A tech person suggested I hold the converter underwater and clean it and to my surprise, it worked. I did the same with my Blue Lagoon, and it cleaned it up pretty well. There is still a little there, that I think won't come out with a solvent, but I'm not going to put one in there unless someone (like Visconti) can suggest one that won't hurt the pen.... and I can definiely just leave it...

[yazeh]

@Lenny77 do what seems best. You can also use an ink remover and let it soak. I know with Doyou, I would leave it in  the pen and forget about it for quite a while. Good Luck  🙏