Here's a couple of things I've done in the past. ONE---moth balls! I buy a box of moth balls and put some in a little plastic baggie--then put the bag in my tank bag, side bags or under the seat. I also do that in my wife's convertible when it's stored during the winter months. Works great and have never had a rodent problem. Only problem is they Stink!! Second, So I read on a different forum to use those dryer sheets--the scented ones. The mice hate the smell--and then at the end of the winter--take them out and our bike smells all nice a sweet!!!
2009 KLR, 2008 Hayabusa, 2007 Interceptor, 2006 VTX 1300, 2012 Can-Am Spyder, 2004 RC 51