IMO gutters has nothing to do with it. The rats and or squirrels has to get through opening in the attic, gutters don’t lead into attic. Mostly likely they chewed hole somewhere? I’d they go down the water heater vent the end up in the garage. Id they go down the dryer vent the end up in the dryer hose which inside garage. Ifyou have attic fans IMO that could be the source of entry if they are not sealing properly? But, there has to be hole big enough foe them to get in.
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