I use Moth Balls. Works great. Smells awful.
Dan

On Wednesday, February 27, 2019 at 9:42:30 PM UTC-5, George Haeh wrote:
The club Grob had copious evidence of rodent infestation and we found that the CG hook opening offers a wide passage. We cut out a piece of aluminum, glued a stack of disk magnets to hold it to the tow hook inside the cage and put on a drawer pull. Also taped inside to protect the finish. Will add some flagging tape so we can find if somebody forgets to remove before towing to runway.

https://photos.app.goo.gl/UugfLA5Dopg1Ebn88

https://photos.app.goo.gl/eDKQaFX4E9hHVRuT6