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if you smear something greasy on your arm and dribble water on it nothing happens. Imagine a bidet as a gentle spray of water and it wont clean anythung.

if you imagine a bidet as a pressure washer, you get soaked clothes and soaked legs and filth splashed everywhere.

if you imagine it as something you need toilet paper with - wet toilet paper is awful and useless and turns to chunks.

if you imagine it like a shower with soap and water then you need a towel afterwards.