The cleaning element contains no liquid, and is designed to never dry out. Put the Replenishment Cap back on after using the LensPen and it will refresh the surface of the tip, assuring that only cleaning compound, not grease, will touch the lens on the next cleaning.
LensPen Lens Cleaner
The black LensPen Lens Cleaner is a small, lightweight, pen-shaped cleaning tool, designed for camera lenses and other optical items. Its 0.47" (12mm) cleaning tip is slightly concave, making it especially compatible with the convex shape of lenses on digital SLR cameras, binoculars, rifle scopes, and more. A retractable brush is included for dust removal.