Rohrer & Klingner Nib Cleaner
This is perfect for cleaning your dipping nibs and fountain pen nibs and it also removes persistant stains while being gentle to fountain pen sealings and ink feed.
How to use:
Fill the cleaner in your fountain pen (or for dipping nibs, emerse the nib in the cleaner) – allow it to soak 5 minutes – rinse your pen with plenty of water. If necessary repeat the usage and prolong exposure time.