[Hermie's rule]

If you've got fresh raw ungranulated garlic then peel the garlic and place the whole clove of it directly in the middle of the stream of ants smack dab on the middle of the floor. The ants should turn around and leave. If not then you should put garlic in the tat out of the crabs reach. Garlic is an insect repellant meaning it'll also repel crabs but they'll be fine. Hopefully the pests should soon scamper.