If you use heavy grease like the military did remember you will have to clean the nasty muck off. OK when one has to occupy idle hands but not what you want to do on a Saturday afternoon.
In my youth we used Silkolene Sozzle, a tractor laying up fluid, to protect our bikes from the ravages of winter. When spring arrived we just washed it off with paraffin or Gunk. Like Gunk, Sozzle has long since disappeared and the old Silkolene company seems to have re-invented itself.
For protecting small steel parts I have found that Corotex corrosion inhibitor paper works a treat. However brass develops a green surface if wrapped in it for a few months. I contacted the manufacturer, MetPro Group, and they suggected using their corrosion inhibitor plastic bags. I now, happily, have a near infinite supply of their A4 plastic bags for storing small parts. They do large bags that will take a large chuck.
JA