I found the easiest way to apply oil is a can of spray on cooking oil. Always spray it before it goes back in bag.

Inside is different - best way it to buy some real cheap bacon or snags cook till you have heaps of fat. Let it cool to a white sludge and using paper towel just spread it out and leave it. It will soak into the cast iron.

If it looks dry spray it. Leave the spray in the bag with the camp ovens.

We use cast iron pans in the kitchen at home. Once well seasoned you hardly ever have to wash them. Just scrape rinse wipe and put away most of the time.