It doesn’t matter how expensive your candle holder is; they are bound to get messy after you light a candle over it. Although there might be little to know about dark burnt residue, it is still a lot of hard work to get the wax off of it. One way to clean the holder is to heat the holder by placing it in hot water. Simmer the water on a stovetop and place the holder inside it. Allow the wax to melt completely. But this method will take some time. Another way is to keep the holder inside a freezer. Keep it like that for a few hours. If the wax is shrunk enough, you will be able to just pop them out without leaving any residue.