Sherlock Holmes uses a Razor!

I stooped under the rude lintel, and there he sat upon a stone outside, his gray eyes dancing with amusement as they fell upon my astonished features. He was thin and worn, but clear and alert, his keen face bronzed by the sun and roughened by the wind. In his tweed suit and cloth cap he looked like any other tourist upon the moor, and he had contrived, with that catlike love of personal cleanliness which was one of his characteristics, that his chin should be as smooth and his linen as perfect as if he were in Baker Street.

--- The Hound of the Baskervilles (1902)

When I approached your room, I examined the window. You amused me by supposing that I was contemplating the possibility of someone having in broad daylight, under the eyes of all these opposite rooms, forced himself through it. Such an idea was absurd. I was measuring how tall a man would need to be in order to see, as he passed, what papers were on the central table. I am six feet high, and I could do it with an effort.

---The Three Students (1904)