definitely put out the old fashioned traps wherever you have seen them or have seen their feces. They work well. Peanut butter works! We have tried other sticky traps and I wouldn't use them again.
We've used traps, but there are alternatives if you prefer.https://www.hometalk.com/17874894/easy-no-kill-way-to-keep-mice-away
Peppermint oil is definitely helpful around doors and places you know they're getting in at. I would do a walk around the perimeter of your home and stuff any places that mice be getting in with steel wool. After that good old fashioned mouse traps seem to work the best. They do make live traps though if you don't want to kill the little dudes.
If they are getting inside your house, the only way to seriously get rid of them coming in, is to seal up every single entry point you find. Beyond that, you can use traps....or a cat :)
A cat! But if that isn't possible - mice traps work great!
The little snap traps work well. Getting a cat who is a good mouser helps too!
You have to find out where their entrance points are coming into your house and seal those off so they can't get in then set traps to kill them. We had to do this in our attic and had to use an exterminator because I wouldn't go into the attic to get the dead ones out of the traps and they stink after a few days...
Peppermint oil, cayenne pepper, pepper and cloves. Mice are said to hate the smell of these. Lightly soak some cotton balls in oils from one or more of these foods and leave the cotton balls in places where you've had problems with mice.
If going the DIY route, be careful if you have children or pets, many remedies can be toxic to them. Or pony up for a reputable exterminator if you are squeamish. I have gone the DIY methods with success. If a serious infestation, call an exterminator.
First, find the entry point and fix it to prevent them from entering. Then, use these to repel them: https://amzn.to/36jKYPn
If you or your neighbors are feeding birds, it needs to stop. Seeds (including grass seed), grains, animal feces, etc. attract mice. At this time of year, an entry hold the size of a dime will give them entry. They will chew on electrical wiring, wiring harnesses in garaged (and not garaged) vehicles, tractors, etc.
Your kitchen appliances should be moved out to clean behind and beneath. Check for crumbs in toasters, between countertops and appliances, etc.. Clean out all cabinets and scrub them, letting them dry before replacing articles.
If you have ground covers/tall grasses in your yard, thin them out or remove them.
Check you basement, foundation sill plate areas, dryer lint trap outside, chimney (should be capped), entry doors, garage door sides and bottom and insure no openings exist.
Make sure no hiding places exist in wood piles, rock walls, etc.
Peppermint and dryer sheets placed in large quantities around your garage, in stored vehicles/sheds are effective. Food items must be stored in airtight containers that mice cannot chew through.
Given reproductive rates of rodents, you may need an exterminator's assistance, but get a written guarantee.
Here’s what worked for us: https://www.frugalfamilytimes.com/2018/10/how-to-get-rid-of-mice-rodent-proofing.html