In addition to plugging all openings, removing all food, soap, candles, firewood and a thorough cleaning. I put rubber snakes under the TT.
I've also made one of those moving, predator silhouettes, like they have at the campgrounds to scare geese. It's a waterproof piece of corrugated cardboard. Cut two pieces in the basic shape of big slinking cat, paint it and make BIG high-vis eyes. Glue an upside down jar between the pieces, and fasten them together, put the jar on a stake in the ground. The wind makes it move. It doesn't have to look all that realistic. The movement and the eyes are what scares the critters.