Sea glass is naturally prized for its frosted, etched finish, but if you want to restore its "wet" and shiny appearance for jewelry or display, the most common method is to apply a tiny amount of baby oil or mineral oil. Using a cotton swab, lightly coat the surface of the glass and then buff it with a soft, lint-free cloth to remove any excess; this fills in the tiny pits on the surface, making it appear clear and vibrant. For a more permanent shine, some crafters use a clear gloss spray sealant or a specialized glass wax, though this can be difficult to reverse if you decide you prefer the frosted look later. If the glass is simply dirty or dull from salt and grime, a gentle soak in warm soapy water or a mild vinegar solution can brighten it significantly without removing the natural matte texture. It is important to avoid abrasive cleaners that could scratch the glass further. If you accidentally make it too shiny with oil, a quick wash with dish soap will usually restore the original frosted finish.