N.
We had a possum in our attic and were told to use fox urine to get rid of it. We bought a small bottle of it at The Feed Store (I think that's what it's called) on Main Street in Grapevine, but I'm sure you can get it at other similar places, and using disposable gloves, 'cause you don't want this stuff getting on you, put it on several cotton balls and threw them into the attic. I would think it would work the same for your little grill closet thing in the back yard (???).
Good luck!