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stroppo said..
Try Ranex rust buster it should not effect the plastic !
+1 Stroppo's and PKenny's' comments.
Ranex is good...it's a phosphoric acid.
Septone make one too....it's got some oxalic acid as well as the phosphoric.
Worked a treat on my boat to remove rust stains around the stanchion bases and won't touch plastic.
Old toothbrush to work it into the deck..leave it a few minutes and repeat ..I've just been doing it on my epoxy board!!! Looking good so far.
If you use toothbrush, watch your eyes!