The Professor Krystal Vision Optics & Screen Cleaner is designed specifically for cleaning todays sonar and GPS units. Most household cleaners dont work, and many can damage your expensiveequipment. Incredibly effective, you won’tbelieve how well it will clean your screen from anything your boat comes in contact with flying down the water, or anywhere else you might be. The Professor Krystal Vision Optics & Screen Cleaner is also great for cleaning, motorcycle helmets, boat visors, LCD screens of every kind, binoculars, camera lens, etc.