I am using Advance Carpenter Ant bait and it seems that they are ignoring the bait. I have applied on the ground where they are going up the wall. You can see their path across the top of the wall. I have taped business cards on the side of the wall directly in their path with Advance Carpenter Ant bait and it seems like the first day you can see them taking the bait back to their nest. After several days they go past the bait and ignore it. Is there a better bait, and does the bait loose it appeal after it has been outside for a vew days?