If you don’t want to use chemicals,
look into “diatomaceous earth”.
Kills anything with an exoskeleton.
BALONEY! Like most “organic” pest control remedies, DE is way over-hyped. (I've got bugs that LIVE in my bags of DE!) Most will work somewhat, never thoroughly, and usually for a very short period of time.
Despite all the hippie-talk about it, there's a very good reason why man-made fertilizers and pesticides were invented and became popular—the old ways didn't work as well!
I LOVE diatomaceous earth and use it everywhere: wood pile, crawl space, attic, storage boxes, under pet beds and behind any new construction.
Did you know that diatomaceous earth, milky spores and snail bait are the exact same stuff, just in different sizes for different uses.