I thought my MIL had gone crazy when she hung those ziploc bags by her carport door where the dogs lay.But they really do work! NO flies and the ones that you did see kept on going. If it works at my house,It should work anywhere( my DH cleans out poultry houses , we have a small pile of chicken litter behind the house in the pasture, not to mention the equipement he uses is sometimes caked with it and it works on our porches and by the doors. NO FLIES.