There are some things ants can't stand. I believe white wine vinegar is one of them. You need to eradicate the trails more than you need to eradicate individual ants.
In other (past) related news (not to hijack your own Pub post ;)) my best friend B, who I've known since 7, is having a birthday today (he is 43, I believe) and a sinkhole just developed in his backyard. I recall this because me and my Father and two uncles had just finished repairing a sinkhole 30+ years ago, when it was discovered the kitchen had become infested with ants. I smashed many with a half bent butter knife before we sprayed, remembering to never use the bent "ant smash knife" again during mealtime.
Hope your day works out, ha. More coffee here, too!