Wick Trimmers The perfect tool to care for your candle to promote a clean burn. £7.99 Out of stock. In order to keep your candle burning beautifully clean, it is paramount that you care for it by trimming the wick in between every burn to 7mm in length. This prevents your candle from sooting, and promotes a clean candle free from wick droppings. It is also important from a safety point of view that you trim your wick to ensure the flame remains steady. Please note, over trimming the wick will affect the melt pool and could result in tunneling, so we advise you carefully pay attention to this also and do not trim too short.