Is your pool open now?
It's pretty unlikely -- if your pool got slimed over the winter -- that there's any oil left floating around. Almost certainly, it's been emulsified and biodegraded.
If you maintained your chemistry over the winter, it's not too likely to be there, either. Over time, oils tend to leave the pool. I'm honestly not sure how, but it happens every day since large quantities of oils, including some petroleum based, enter pools via lotions on swimmers.
Ben
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