by far the best ant killer is
Terro ant killer. here's how it works:
it's like a very sweet goop that ants love to eat. it has something in it that slowly kills ants. tons of ants flock around it and eat it up and bring some back to their colony to feed the queen. the queen, as well as all of the other ants, die.
i used to have a huge ant problem (there were literally huge colonies of ants all over our house). we used ant traps, which the ants never went in; spray, which didn't permanantly solve anything; and naturally we had tons of spiders, which couldn't handle all the ants. then we got Terro and within a month, our house was ant free.
Jam it back in, in the dark.