Our cats are part of the problem. One of them has a catch and release program in place. She catches them outside and releases them inside, normally in our bedroom

We have been using Tomcat mouse traps. First time we got a hit within 2 hours with peanut butter, but after that they learned how to lick it off without setting off the trap. We are now using dates, they squidge nicely on the trap and they can't seem to get it off.

Whatever happens pray they did not take up residence in your washing machine. It really stinks, even when cleaned out.