8. Pet excreta
Although you might think that making your pet relieve itself outside helps in keeping the harmful bacteria at bay, that is a misconception. These germs will enter the house sooner or later, mostly through the fur and paws of your pet. It becomes a part of your surrounding soil and can come attached with shoes whenever anyone walks outside. It can also be incorporated in aerial dust that sits on our floors and furniture each day. Make sure you vacuum around the house at least once in a week.
Even if you are not that big on cleaning, these unlikely filth accumulators might make you want to focus even more on making your surroundings more sanitary. Is there anything on this list that was unexpected for you?