How do you get rid of persistant ants?

We live in a second story condo, and we have a recurring ant problem. When they come, it is an army of them coming up the building, through the edge of a window or door and marching to some random thing that often I wouldn't have thought they'd want. We keep things clean, and whenever we find something new they like we make sure to clean it, keep it unavailable, etc. They go for the toaster over, the dog's dish, water bowl, water in the sink, etc.

We've tried various different types of ant traps, and spray the edges of doors and windows with raid or similar products but they keep coming back.

Any other suggestions?

Hi...I recently saw on a news story, this young man for his science project tried numerous things to stop ants.....What stopped them ?? BABY POWDER

Good Luck and God Bless !!

If they are 'tiny' ants then the discs usually work after a few days from putting them out. If they keep coming then get an exterminator to find the nest.