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It’s not necessarily the amount of sweat, it’s the PH level of their sweat. Many things can affect ph genetically, but poor diet and heavy alcohol use (think culturally the 1950’s-80’s) doesn’t help.
There’s also the ubiquitous cigarette ash and the multitude of garbage in that which these watches have had dropped on them while people hold a durry in their left hand. On more recent watches it’s a lot rarer but vintage ones are frequently covered in it.