Storage Hazards

In rummaging through classic computer stuff I haven't seen in a while, I saw several things that are definitely a problem. What other things need to be added to the list for collectors to watch out for? * Leaky nicad batteries that will "eat" the circuit board traces The early computers that come quickly to mind are the TRS-100, Lobo Drives Max 80, NEC 8201A, 286 and later motherboards, and S-100 CompuWatch Clock/Calendar boards. Any others that should be added to this list? * Subterranean termites (eating manuals and other cardboard/paper products) Fortunately, they had only mostly started on the cardboard boxes, and only damaged some of the manuals. I'm thinking that keeping the manuals in ziplock bags might be a good idea for any manuals that need to be packed away. This would also protect them from moisture if the boxes got wet. * Leaky storage areas leading to equipment and documentation being ruined. I've had quite a few books and manuals that had to be thrown away (nothing really rare, hard to come by, or valuable) due to a leaky roof where they were being stored.