For those interested, a few of my co-workers and myself have been using peppermint oil to rid our homes, sheds, barns and vehicles of rodents for the past 4-8 weeks. All of us used simular techniques by putting 3-5 drops of peppermint oil on cotton balls and placed them where we thought the critters were. We are 100% in agreement that the peppermint oil has worked and our places are rodent free! The oil was used to get rid of mice, rats, chipmunks and squirrels...... it worked on all of them equally well. If you want more info on this method feel free to post here and I will try to answer your questions.