Really simple solution. Stick the votive glass in the freezer for 20 minutes. The leftover candle wax will just pop out with a little nudge from a knife.
I just put mine in the sink with hot tap water inside the holder and the wax becomes soft enough to get out with a teaspoon. Thanks for the freezer tip (isn't this a place you can store candles to help them last longer? - or maybe I've mixed tips up again!).
Hi, I use the freezer method all the time. Usually leave votives in an hour. woulnd't try this with a really delicate piece of crystal, tho. Like those crystal stem gllasses candle holders that are popular.