Pen Cleaning Fluid is formulated to react with drawing ink so as to dissolve it efficiently. It can also be used for cleaning drafting instruments such as templates and lettering guides as the solution will not damage the plastic.
Allow plenty of soak time for badly encrusted nibs or ones that have been left unused for long periods.

Rotring Pen Cleaner Fluid

For Cleaning Drawing Instruments used with Non-etching Drawing Inks. 100ml of Concentated Technical Pen Cleaner for Cleaning Dirty, Encrusted Technical Pens and Nibs. Use Dissolved in Water.