I'm knocking wood like my knuckles might split, but I'm at a complete loss as to why we haven't had rodent problems in our Interstate. I don't know about a salt lick, but I do keep a commercial-grade bait station in our storage unit. Five more bait stations surround our house. We are constantly finding rodent carcasses. That's just the way things are in Houston.
I'm a fan of Lou Manfredini. He recommends a product called Mouse Magic. The reviews are mixed, but where negative reviews are rendered, there seems to be a correlation with reports of food being pilfered. I am guessing that, if food is present, nothing short of a flame-thrower is going to serve as a deterrent. But if there is absolutely no food, then the scented repellents might have a chance of working.
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