Last year I had some mice in my garage after I left some sunflower seeds in the garage.  They got everywhere!  Eventually I thought I trapped all of them and they were gone.  Wrong! Last year I did not use one of my ice shanties and I was going to sell it this year.  I opened it up to set it up to take pictures and there was bedding in there, several holes in the fabric and the whole thing smelled like urine!  Needless to say the shanty is not going to go up for sale and I threw it to the curb! Check your shanties often for mice and stuff laundry sheets in it. Hopefully that deters them away.  Yuck, what a mess!