I like the ultrasonic deterrents, have them in my shed and garage, don't see any rodents or any signs of rodent activity, they have worked for years now.
Sheet rubber – if you can find a burst used tire tube, that will likely be cheapest. A tire shop or mechanic will likely give you a burst one free if he has one (they go in the bin otherwise) You can also get sheet neoprene (oil resistant) from any seal or gasket supplier ie industrial supply firms, or maybe bearing suppliers.
Edited By Jeff Dayman on 25/03/2020 20:52:39