25mm One-Click Fiber Optic Cleaning Pen that is great for quickly removing dirt, dust, oil, and grease from optical fiber adapters. It is designed to clean LC and MU connectors. Want help or have questions?This is a 1. This fiber optic cleaning pen is great at cleaning hard-to-reach areas, ferrule end-faces and inside the plug. FOCCUSTM Fiber-WashTM NF Precision Fiber Optic Cleaning Pen contains a nonflammable solvent cleaner that quickly and safely cleans the end face of fiber optic connectors, splices and ribbons. Use the Debris Destroyer™ to moisten cassette cleaners such as CLETOP-S and OPTIPOP-R, or FiberWipe™ and CleanWipe™, as well as One-Click™ cleaners for the wet cleaning of tough end-face contamination challenges.