We have had trouble with ants in the van for a few months.
Only the one type / size etc of ant so I reckon there was a nest in the walls somewhere.
Tried all sorts of ant poisons and nothing got rid of them.
Was looking around Bunnings one day and saw Combat Ant Rid there. $ 6.89.
I bought one to try. It is 6 small ( about size of 50c piece ) baits in sealed plastic containers that you put around the place where you see the ants.
You must use all the baits together. you see an increase in activity for a day or so but must not spray or interfere with the ants.
After 3-4 days all ants had disappeared.
we haven't had an ant in the van now for over 2 months.
For $6.89 a great result I reckon.
Last night as I was on the stair
I saw a man that wasn't there
He wasn't there again today
I wish he'd bloody go away.