A lot of roaches will make a mess. You can find some concentrated solution from Mitre 10 (Pest Patrol from Amgrow). Not cheap but the best I've used. It dillutes (100ml) in water and makes 5L of spray solution. If they're rats use the large blue pellets from bunnings. They love the stuff and they're very effective. If you spray do it on a week-end so you can leave the whole house open to vent.
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