One who lights Hanukkah candles with oil and cotton wool wicks. Is it allowed to use yesterday's wicks again for the same candle or for another candle? There is no difference in the quality of light flame in the wicks that have already been used. Is it allowed to use the wick of the Shamash for a regular candle or the Shamash's wick for a regular candle? Should a new wick be put in the new candle of that day or can one of the old wicks also be used?
You can learn from Shabbat candles where you singe the wicks to make them easier to light, they are pre-charred therefore better (in משנה ברורה תרעג:לא it indicates even if they are pre-used). Unless your taste prefers them to be new. It's brought in Ben Ish Chai Halakhot you should pre singe the wicks so they're easy for the woman to light for the house.