Yup I am the fly killer in my home. They are disgusting things but me and my pink swatter are pretty good at getting them.
I did have a some fruit flies now they were everywhere. I went on line and found out how to get them. Put some apple cider in a small jar and cover it with plastic wrap. Then poke some holes in it. I used size two knitting needle. Worked great I could not believe that it worked. Also bleach doesn't work down the drain boiling water is what they said would work the best. Within a couple of days I was cleared of any flies.
I don't know if it will work for regular house flies or not but it sure does work for fruit flies.