We have had the same problem on and off.
We have two kids who make a lot of snack/food mess so the mice are attracted to that - but we’ve since made a huge effort to meticulously clean up everything and we have filled up all the possible known access points too. They’ve 99% gone.

The snap traps we have are very effective in attractive them - and it kills them swiftly. We tried humane traps but never caught a single one!

Hope you get to make more waves in tackling the problem.

Great to see you posting about this @exyle - I’m always slightly embarrassed talking about the problem.
But it’s good (not good, but y’know) to see others talking about how they deal with the situation.