Plugging the access has been very effective for me to prevent new arrivals.
When I moved in n '01, I dug down a couple feet and closed all the cracks and gaps in my cinder block foundation. I still have bait packs inside and they have been untouched since then.
I also removed all the plants close to the foundation. Unfortunately, my wife has made flower beds in the front so I am keeping close watch, now!
Good luck!
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