Why Do Flies Leave Stains on Surfaces?
WouterFlies are often the culprits in leaving stains on surfaces. This is due to the liquid excreted by adult flies. The types of stains they leave vary among species. Stains on smooth surfaces commonly appear round or asymmetrically shaped. Some stains may also have tails or be linear in shape. They are most likely feces. The tails, which are produced by the fly’s protruding anus, are often pointed in the direction in which the fly’s anus is moving.
While flies do not pose a health risk to humans, their excrement is very noticeable and produces a strong odor. This makes them a big problem in commercial settings, where they can contaminate food preparation areas and even food. Having a large infestation of these flies in a restaurant can lead to fines or even closure.
The best way to remove flies’ stains is to use a nontoxic product such as Spot Free. It is made from peppermint and eucalyptus essential oils and is completely non-toxic. It can be used on windows and exterior surfaces. Fans say it works remarkably well.
The most common flies that cause stains are drain flies. Their larvae feed on earthworms. As adults, they seek overwintering sites in houses. They then emerge and resume flying activity once their diapause ends. Another common fly is the stable fly, which deposits eggs in rotting vegetation and animal waste. This species may bite livestock in order to obtain blood for its eggs.
