Film on pool skimmer

Welcome to TFP.

I've never heard of any grease on an Intex but it's possible that it's silicone lube from the parts. You can clean it off with a Magic Eraser.
Also, tell us which pump, filter, etc you have.
 
Chlorine will almost certainly break it down, whatever it is, but that may take a while. If it continues to accumulate you can use a skum bug or skum ball in the skimmer to collect the oily stuff before it accumulates on the walls.
 
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