This is a very long video but the gist of it is as follows 1.) Check books regularly for mold 2.) If mold develops, clean with a hydrogen peroxide based cleaner 3.) temperatures of -40 will kill mold, so will harsh direct sunlight or uv light 4.) keep the humidity levels in your book storing space at 35% or lower when possible 5.) moisture control silica packs are a MUST for bookshelves in humid climates 6.) MOLD SPORES ARE DANGEROUS AND YOU NEED TO RUN AN AIR PURIFIER WITH A HEPA FILTER #bookstorage #library #bookcollection #bookcollector #cleantok