I read it on the internet

The candle I had in this candle holder had burned down to the nub and left that nasty pile-o'-wax behind. I didn't feel like scratching at it with a plastic knife, so I consulted Google as to a better way of getting it out.

Opinion seemed split whether heat or cold worked better, but the freezers claimed their method had less residue, so I gave it a shot.

I left the glass part in the freezer for a couple of days, and afterwards, yes, the wax popped out in one piece with just a little poking and whacking. However, the glass wasn't all shiny and bright, so I gave a nod to the heaters and ran it through the dishwasher.

Now it looks great. Thanks, internet.