Koh-I-Noor Rapido-Eze Cleaning Solution, 32 oz. Bottle, 1 Each (30687) Cleaning fluid for the quick removal and maintenance of technical pens Unclogs pen points, technical pens, calligraphy pens, airbrushes Dissolves dried ink on all pen parts Non-flammable and doesn't harm plastic or metal Keep your pens clean for long-lasting use