Arcus Artisan Pen Cleaning Solutions come in 2 formulas: Water-based Soaking and Flushing Solution: - Ideal for cleaning and soaking delicate nibs and feeders - All around solution for flushing out inks - Rinse nib and feed after flushing or soaking with this formula Alcohol-based Soaking Solution: - Does not cause rust to nibs - For thorough cleaning of nibs and feeders - Can remove stains on pen cap and body - Low odour