Cockroach balls made with boric acid. Don't put in places accessible to children or pets. Ingredients: 200g of boric acid; 1 medium onion (You can use onion flakes but they’re not as good); 1 cup of flour; 1/4 tsp of salt; About 100ml of milk.
Boric Acid Ant Poison Recipe | eHow.com - Trying this now... No success with cornmeal (southern ants), coffee (hyper ants), vinegar spray (clean ants), or ant spray (bionic ants?). This is kinda a last ditch effort to keep my sanity.