[sarbear]

I found a flea or 2 on my little guy so i picked up a medication from my vet called comfortis. How long should i not see any more fleas. I wasnt seeing alot to begin with ive only seen 2 but i washed everything and vacuumed like crazy and its been about 5 hrs since he took the chewable. My question is since I washed everything already and i still see a flea do i need to keep washing everything over and over until there are no fleas left? The medication says it should kill everything from 98-100% in 4hrs but i just saw one. Ughhh someone fill me in!