Suits candles that are about Ø22 cm.
Preheat oven to 75°C. Place the candle holder upside down on a plate or grid covered with baking sheet paper. Put in the oven for about 10 minutes. Remove the candlestick again and wipe with paper towels. Note that the candlestick is very warm - so wipe gently.
Never attempt to clean the candle holder with a sharp object or by soaking it.