It probably depends a lot on where you trap.
Around here critters are used to having rusty metal laying around.
They aren'y shy about it.
As long as thats the only scent on the trap.
Running NEW traps through the dishwasher will remove all scent about as quickly as anything as long as the dish soap isn't scented.
BTW it also works for snare wire.
best of luck
just
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