We have the same problem in Southern CA. I also find the cleanest way to get rid of them is to get rid of the food source. This can be a dead fly or a piece of

We have the same problem in Southern CA. I also find the cleanest way to get rid of them is to get rid of the food source. This can be a dead fly or a piece of dog food. Remove it and the area is clean within a few hours. In the summer it's really hard though. it seems they also go after water when it's hot.