My cats has a problem with fleas...?

my himalayan loves to sneak out of our all tile house about once a month. she always comes in infested with fleas. i have heard of different remidies for fleas but it seems they only work for a short while. advantage and the other vet stuff doesn't seem to work for very long, someone told me about a vinegar and water solution. does it work and how much of what should i try?