Depending on the size, and thickness of your vase, you could put it in a container/tub of boiling hot water, and the wax should be easy to move after about 30/mins. If not, if the wax is thick, take a woodburner with a hot knife attatchment and cut it into small enough pieces, tap it lightly until the pieces come out. If none of this works, post back and i might have some more ideas.
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