How did Charles Winchester not sweat in an episode of mash?

In the MAS*H episode titled "The General Swiped My Pad," Charles Winchester famously claims he does not sweat due to his strict adherence to a personal hygiene regimen and his belief in maintaining composure. This character trait is used for comedic effect, contrasting with the chaotic and often sweaty environment of the Korean War. The scene highlights his pretentious nature and adds to the humor of the series, showcasing his attempts to maintain an air of sophistication amidst the disorder.