Honesltly I dunno. german roaches are very hard to kill. Can't say on the other critters if you can't ID them. Like silverfish aren't much of a problem unless they're eating your books, but carpenter ants are a big problem.
If you want to try an "organic" solution try paying neighborhood kids to bring you house centipedes (the gnarly ones with giant legs) and various spiders. idk if house centipedes can tackle a german cockroach but they'll eat everything smaller than that very efficiently.
Honesltly I dunno. german roaches are very hard to kill. Can't say on the other critters if you can't ID them. Like silverfish aren't much of a problem unless they're eating your books, but carpenter ants are a big problem.
If you want to try an "organic" solution try paying neighborhood kids to bring you house centipedes (the gnarly ones with giant legs) and various spiders. idk if house centipedes can tackle a german cockroach but they'll eat everything smaller than that very efficiently.