Along with the normal stuff - we also
Remove the flat screen TV about January - (Viewsonic can only tolerate -4 degrees in storage).
Any other LCD display (phones, laptops, etc).
Toiletries - water based soaps, toothpastes, deodorants, etc. They expand and make a mess, not just from freeze but also from extreme heat.
We still have a bad habit of leaving 1 or 2 water bottles in there that we stashed. It shows up in the spring split open and empty. We did a thorough search this time, but then we always do and still miss 1 or 2.