I occasionally use these scented candles to freshen up the air in my house when I expect company. My kitchen is very close to the living room, so when I prepare a large meal all the cooking smells go there, which is not always a good thing. I have used various aerosol sprays to take care of that; then I discovered these odor control candles. What I like about them is that their fragrance is very delicate, barely noticeable, yet the odor-killing ingredient works very well, so I end up with fresh air vs. "perfumed" house.
The candles come in two scents, Clean (blue candles) and Outdoors (green ones); I prefer Clean. I light one candle about 15-20 minutes before company arrives, placing the holder on the coffee table in the living room; it quickly melts and releases the odor-fighting element. The effect lasts while the candle is burning, and a little bit afterwards.
The candles are rather small, but they last well (about 2, 5-3 hours each). One pack contains a special glass holder and two candles; refill packs of 6 candles are also available.