I’ve used these mouse repellents in an RV. Worked well
I know I am late, but I had to let you know about this product. I first used this product maybe 15 years ago and I can tell you it works. It even works to keep the squirrels out (I guess they are rodents too). Anyway, it avoids poisons so that works for me.
Here is an article about it: https://pestsoff.com/how-to-get-rid-of-mice/fresh-cab-rodent-repellent-reviews/
Here it is on amazon: https://www.amazon.com/Fresh-Cab-Botanical-Control-Repellent/dp/B0119AY5FU
I only replace the old ones about once every two years.