This is mostly done in a painless and quick way.
Catch mice attic.
Gnaw marks can be found on just about every hard surface such as your floor rafters in the ceiling house siding electrical wires ventilation ducts and areas around pipes inside your walls.
The trap must be big enough to catch the mice or they will escape.
Check the trap daily and relocate the mice you catch several miles away from your house.
Scraping scrambling bumping thumping and sometimes squeaking.
To use this funnel leave one opening unsealed and position the funnel over it.
One way exclusion funnels are also useful in removing mice from your attic.
Lethal traps on the other hand catch and kill the mice instantly.
Bait a humane rodent trap available online and at most home depot stores with cheese or peanut butter and set it in your attic.
If you have mice living in your attic it is likely that they are traveling down through your wall voids to access areas of your home that have food or water sources.