Couple ways:
1. Cold water. Yea, sometimes actors are showering under ice cold water. That’s love of art.
2. Cold water but with practical effects. You can use a vaporizer to put things like PG into the air. looks like a steamy shower then but it’s still ice cold and won’t fog up the lens.
3. Coat the lens with a hydrophobic substance. Prevents water from condensing on the lens, at least somewhat.
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