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Hans, it can depend on which baits they use and how they distribute them. Which baits they can use varies from state to state so NSW suggestions might not be appropriate for Vic.
The last time the exterminators were here, as well as baits in the roof we had them put more behind the bushes around the property boundaries. These go in pet proof holders so the dog can't get into them. Rats use the fences as cover when they are scuttling around. A couple of days later we found one dead rat outside.
We also found the hole where the possum was getting in and blocked it during the day while it was outside.
No creature noises in the roof for months.
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