1 hour ago, AlaMoi said:as 'things' happen,,,, bread boxes can become overwhelmed with mold spores.
a thorough wash with bleach or strong vinegar will kill mold spores - you may have to repeat . . .
I have used @Alex's concentration of bleach and submerged the breadbox in a tall stock pot for half hour or so. We'll have to see if this increases the time before mould starts.
I find that just hanging out in the kitchen, the open end of fresh bread develops a hard surface, whereas in the breadbox, the bread stays soft. Until day 3 or 4 which is time for the toaster anyway.