How do you sand doors and ladders off the superstructure of ships without removing detail around them?
Apply masking tape to the bulkhead surfaces to protect details. Then sand with a sliver of sanding stick/emory board, not a whole piece wraped around your finger.
I’ve found some commercially available - called Twigs. They look to be the left overs from the manufacture of beauty shop nail files. They are about 1/8 inch wide. They are firm and square and can get into the deck/bulkhead corner
Ed, those sound great. Where do you get them?
I have used the Flex-i-File for some applications like this and others where you are trying to sand a rounded part and don’t want to square it off. The tool looks like a letter U with a narrow band of sandpaper strung between the uprights. WS

The pricetag is from Hobby Lobby, but I’ve also gotten them at the LHS. They come in packs of 20.
Ed,
thanks for posting that information. WS
Another thing to try is a hobby chisel, which is usually my first tool of choice with my 1/700 ships (talk about no room to manuever). I got mine from Micro-Mark, and if you don’t use too much force, you can remove a watertight door with one or two swipes and have a clean surface remaining. If you do use too much force, or the chisel happens to slip, well … Band-Aids are always a good thing to have on your workbench. [;)]