Dry cleaning should remove any living organism on the bag. Just be sure to fully airiate the bag for a week before using it. The problem with washing is that the temps needed to kill the bad stuff is also bad for the bag. Bleach is also bad news for most bags. If you do not dry clean you may have to wash and fully the bag several times to be safe. Another consideration is that as you sleep in and warm the bag it may start to smell like its previous owner if you do not totally clean the bag.