Ant invasion on dishwasher

[what4]

For several kinds of ants, we've had good luck with the kind of bait they take back to the nest, similar to Amdro for fire ants.

For ants that don't take that bait, there are boric acid products you spread where they will walk in it. They will take this back to the nest, ingest it while cleaning one another, and the colony will die slowly.

Basically, ants just keep coming back, so it's worth being prepared to respond to them without getting upset about it. Unless someone in the household cultivates opportunities to get upset.