Cleaning LifeStraw pitchers

The cleaning directions for LifeStraw pitchers says that filter housing is to be rinsed with water only and filters are to be rinsed with water only. Filters don’t need to be removed from filter housing for cleaning. Isn’t there a biofilm growing within the filter housing and shouldn’t the interior of the filter housing be cleaned with Dawn and water just like the pitcher. It’s a pain to take everything apart but seems to me biofilm makes that necessary. I hope I’m wrong and would love to hear thoughts on this.