We mix this pen cleaning solution right here in our St. Louis, Missouri storefront. It removes ink from steel pen nibs and works as a pen flush for fountain pens. Use it with a rag to wipe your nibs clean after use, or soak crusted nibs in the solution overnight. It works with all sorts of inks, and it won't harm your pen nib.
Note: one of the active ingredients in our pen cleaner is ammonia. It doesn't smell too strong, but anyone who is unusually sensitive to odors may want to choose a different product.