How long does "flea dirt" hang around?

@sedel1027 (17854)
United States
September 30, 2007 11:54pm CST
It has been 2 weeks since we treated for fleas. We haven't seen a flea in about a week and a half. I have noticed that one of the cats still leaves "flea dirt" when she sits down. Not all the time, but every now and again. Since they aren't scratching and we have not seen any fleas, I am assuming they are gone. How long does it take for the dander to go away?
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