The answer to 'mouse odor' is that a mouse odor is typically caused by the presence of mice in your home. Mice leave behind urine and droppings that can create unpleasant smells. Common symptoms of a mouse odor include a musty, ammonia-like smell, as well as seeing mouse droppings or hearing scratching noises in your walls or attic.
The best solution for a mouse odor is to address the root cause by removing any mice from your home. This may involve setting humane traps, sealing up entry points, and removing any food sources that are attracting the mice. If the odor persists or you have a significant mouse problem, it's best to call a professional pest control company to properly identify and eliminate the issue.