Leave your handbrake on nice and tight
Leave your battery connected
Don't wipe down your steering wheel and gear knob so that the mold can really get to work on the leather
Don't check the vehicle for 4 months
Evict the mouse when spring comes... Click image for larger version.  Name: 20140418_114904.jpg  Views: 539  Size: 196.0 KB  ID: 2396