Old snow globes can be refreshed with clean water for a new look. The process is simple, and as long as you take care, it will be impossible to tell that you took apart the globe at all.
Remove the glue bond between the globe and the base. Typically, silicone glue is used to bond the two together. Use a sharp putty knife or utility knife to break the seal between the two materials. Do this over a sink, as some of the original water may leak at this point.
Set the base aside. Remove all glue from the snow globe with needle-nose pliers. Locate the area where the gasket fits into the globe. Pry the gasket loose with the pliers. You may have to run the knife around the edge between the globe and gasket to break the glue bond. Remove the rest of the glue from the gasket with pliers.
Drain the water from the globe. Wash out the inside with dish detergent and hot water. Rinse thoroughly. Dry the globe with soft towels.
Add plastic snow or glitter to the dry globe. Replace the gasket inside the globe. Push the gasket into place a little at a time until the gasket is even with the bottom of the globe.
Peel back a small corner of the gasket. Fill the globe with distilled water, using a funnel. Pour in enough water to overflow the globe slightly. Add one teaspoon of white vinegar to the water.
Squeeze silicone glue around the base of the globe. Press the base onto the globe, securing the glue around the gasket and base at the same time. Allow the glue to dry for 24 hours.