Fountain pen cleaner for thorough cleaning of fountain pens and nibs Whenever fountain pen ink has dried up due to not use, but also when you change the ink color, it is necessary to thoroughly clean your fountain pen. Particularly when using filler inks with a high dye content, pigmented filler inks or shimmer inks, deposits can occur in the ink guide, which clog it over time. You should therefore clean your filler at regular intervals. That's why we developed our Octopus Fluids fountain pen cleaner. It is an indispensable tool for cleaning and maintaining high-quality fillers and thus ensuring an unhindered ink flow. The fountain pen cleaning fluid effortlessly and thoroughly removes even dried-in ink residues while being gentle on ink guides, nibs and seals.