ants in pots remedy

I have a few junipers in which ants have set up shop from the drain holes. Just happened in the last few days appranetly.

I have set borax/sugar baits out, but whats the best sure fire way to get the ones in the pots already the heck out. I've read that some have had luck submerging the pot in water for 30 minutes.

What about a drench/soak in either neem or malthion?

Thanks,
Neil

Soak them in a tub of water (Completely under) for half an hour.

While they are soaking clean off the table where they were sitting, and spray the surface with a pyrethrin spray (preferably in the evening).