1 Look at the comb and check for lice, nits, and eggs. 2  If there are lice, nits, or eggs in the comb, wash it thoroughly first before running it through the hair again. 3  Rinse off the conditioner once all areas of the head are combed through. If there are lice, nits, or eggs in the comb, wash it thoroughly first before running it through the hair again. 2  Rinse off the conditioner once all areas of the head are combed through. 3  Repeat the combing process to make sure every area is dealt with.