best citronella candle for keeping away mosquitos? (esp one available in canada)

[MacDoxy]

i was at a small deck bbq party once in New Jersey where they had a few certain powerful citronella candles burning that kept the bugs away -even though you could see bugs flying ten yards away under the light in the yard and bats were having a feast on them. while i was on that deck i didnt get one bite and expected to get eaten alive.

i would really like to get some candles like that here (north of toronto) because the skeeters are traveling in vicious hoards after sundown right now, and i haven't seen candles work as well as that before or since.

the candles at the party looked almost like green carwax cans but i'm not sure if there were other kinds too.

any recommendations?