your ironing board cover is washable-it can be removed and laundered if you get fusible or a starch build up on it. sometimes I put a piece of freezer paper over mine to work on/ protect it from starch, glue or fusibles.
I use starch A Lot. I've never experienced a (bug problem)
my scraps are kept in open boxes, shelves, baskets and rotated/gone through often so I don't worry about it. if they are going to be stored for an extended time I would not use plastic storage containers (totes) and would protect them from moisture/humidity. you don't show where you are---=but, if you live in a humid climate check your stash/scraps often.