You heard me talk about ants and roaches, Maybe the reason for multiple items in the home is for Cases like these. So if you have an infestation you can change the item. (or get rid of it), While Having a replacement items (that are Sanitary) at your disposal after you get rid of the infestation. So By the time you get rid of the infestation you can replace the household items.

and clean the what could be the infested items