I know knats like apple vinegar. I have put it in several jars with a quarter size of dawn. Shake it up. Then poke small holes in the lids and the knats go in and can't get out. Also those sticky traps.
So my two cats are indoor cats and I started noticing these scars like big bites marks on one of them and thought I might have flea's. I bathed them both several times and bombed my apartment twice. I did find a couple on one of them and several on the other. What was weird is I couldn't find...