From what we've seen over the years, it comes from oiled sunbathers OR from swimmers using lotions PRIOR to swimming to avoid dry skin. Like pee, swimmer oils are easier to manage OUT fo the water than in it.
One simple solution is to have a few microfiber towels on the deck for using in wiping off excess lotion, sunscreen, etc. BEFORE entering the pool.
Sams Club has them for cheap; so does Amazon: AmazonBasics Microfiber Cleaning Cloth (Pack of 24)
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