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Ohh, come on, your not gonna pull that one about "small small animals that can't be seen".
We all heard that one before and... right! :)

On the topic; there is so much information that can be had...

Your razor is sterilized, your brush has been sterilized, the soap has been made under the most rigorously controlled conditions and your strop has been smeared with dog poo!

"T.C. Fawley estimated that he had lost 2000 skins, ‘salted grains’ , ‘Chamose leather’ , ‘Spetches’ , also stocks of dog manure, packing cases and salt."
I surely hope my old English strops have...