I always have a (scented) candle burning in my living room and sometimes in my bedroom.
I have found that the only two kinds of candle that burn all the way down and are effective are Yankee Candles and actual church candles - though they aren't scented.
I've tried loads of others and they smell great but don't burn all the way down. They end up pooling with wax.
Does anyone know any cheaper alternatives to Yankee? It's costing me a fortune!