Faeces, urine and sweat – just how gross are hot tubs? A microbiologist explains
Help! New to Hot Tubs, just bought a used Sundance. It's dirty...how should I clean it? : r/hottub
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This is the hot tub of the Airbnb which was the main reason why I rented the spot. Smelled terrible and was obviously not cleaned in forever : r/mildlyinfuriating
Just how gross are hot tubs? A microbiologist explains - ABC News
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