Here is a smartphone lens cleaner that you can take and use anywhere. The WaterBear Universal Glass Cleaner can be used to clean your smartphone lenses, screen, video monitors, DSLR lenses, and everything in between. These are made to use on any device and don’t scratch glass.
The WaterBear Patch sticks to your smartphone or camera and doesn’t leave any residue. It is reusable too. You simply have to rinse with warm water, let it dry, and you are set.[where to get it]