Dr. Ph. Martin'sBombay Pen Cleaner, 2.0 oz

Curiously, this has been more effective with some inks and on some nibs than others. I've had much better results where I've allowed some soaking time, even when the ink was fresh (this, I was not expecting). But overall, I am happy with the product.

I used this on two old but good quality fountain pens. All you do is flush the nib section, soak them in the solution for a couple of hours, flush again and then use as normal. Both pens now keep writing even if I havent used them for a while.Brilliant stuff, expensive but well worth it to get your pens writing like new.