My mom has used these in her garage and has been happy with them. It' an Peppermint Oil packet.

https://smile.amazon.com/SEEKBIT-Repellent-Peppermint-Oil-Deterrent-Basements/dp/B0BLJD74XJ/ref=sr_1_7?keywords=mouse+deterrent&qid=1673235055&sprefix=mouse+de%2Caps%2C166&sr=8-7