The J. Herbin Fountain Pen Cleaning Solution is the fastest, safest, and easiest way to clean your fountain pens.
Made with natural materials, this 50 ml bottle of cleaning solution is safe for fountain pens new and old. Simply draw a small quantity up through the nib, leave it full for 5 minutes, then flush two or three times with clean, cool water.
You needn't use this very often, only if your pen is acting strangely or has not been used for a significant period of time.
SOURCE: Made in France