Raid Ant & Roach Killer
For quick knockdown with residual effects, Raid Ant and Roach Killer will do the job. From one of the most trusted names in insecticides, this is the standard spray by which all others are judged. The active ingredient is a synthetic pyrethrin made from the chrysanthemum plant. Not only does it kill ants on contact, but the formula is mixed with an oil-like petrochemical. This means that the spray will stay moist and active for up to 10 days, killing all the ants that cross the sprayed path. You'll have to repeat the application, but the spray will keep ants out and away from your dwelling. Although it will not directly kill the colony, it's quick knockdown effect is a valuable weapon if your place is overrun by ants.