Spector --
Those buttons you are referring to are called pins. Drift them out from right to left. Carefully pull the trigger housing out. Take down from there is pretty complicated compared to, say, an 870. So be careful. I sprayed Gun Scrubber on my 590 just last week and it was fine. And yes, my trigger housing is also plastic. That film you're talking about is the metal being robbed of its oil. That's what gunscrubber does. It removes oil, grease, fouling and the like. But you have to be sure to oil everything down. Rem oil in the spray can works great. Good luck.
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