As you smudge, you visualize all the previous energies that were absorbed by the candles that were lifted off and cleaned in smoke. Green candles are used for money rituals. Some people also like to see the candle bathed in white light as part of the cleaning process. This is why I recommend using essential oils and not fragrance oil in your candle dressing because essential oils carry the energy and vibration of the plants they were made from, as fragrance oils don’t contain such energy (and are chemicals).
You can also write this down on a piece of paper (known as a petition) and have it near your candle when it’s on fire.