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You might want to get some silicon or marine grease, because the WD-40 will wash away in the rain once water gets into the bushings.
Ye it already did wash away and the creaking came back. I took it off for now because I'm putting in a new muffler soon and it's a pain to have the sway bar there...I'm gonna get some heavy duty auto grease to lube the bushings and then I'm going to re-attach the sway bar to the more aggressive inner hole.