I asked about mice control products on another forum and "Mouse Free" was suggested. Prior to that, we store ours inside at a place that has corn/soybeans inside as well (but they are now strong it outside in high bins) and in the 16 years of being there, problems only had 2-3 times mice got in. Seal up all holes in frame and underbelly. I thought I did, but guess I missed a couple. Inside is a **** shoot on what to use. Because I cannot get to coach while in storage, cannot set out traps to check. So I used a combo of things such as: drier sheets, moth cakes and rodent free smelly things. Like what's been said too, remove all food and hopefully wipe down storage areas of it. If mice do get in, it's a PITA having to wipe everything down w/ a germ killing product.