Borox is good for killing most insects... but it's gotten hard to find, at least around here... If you ever have an ant problem, try a 50/50 mix of borox and honey... they take it home, eat it, and die... Of course, my ants are super ants... they eat the stuff, and come back a few months later... they will form a line around bait traps... I've yet to find a way to kill them all, and I think there hill is under my house... Oh, also... I'm not sure if it would work for fleas, but I think so... it's just expensive and messy... But it kills ants, even super ants... There is this stuff that is made out of orange peels... I found it by googling pet safe ant killer. I can't remember the name... I can see if I can find a bottle of it when I get home if you want.