After setting for so many years, I bet the ground crew has a major time fixing cracks in the skin.
We found that after a B-52 would set on Alert for several months, then be flown, and new cracks would be everywhere.
Fortunately, they coat the skins with a protective chemical with the viscosity of grease.
Because the climate is so dry, there is very little disintegration. The frame and engines are sealed up to prevent dust, and what little moisture there is.
Essentially, it is outdoor dry storage.