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A lot of the rust in the floor pans are caused by old and failing undercoating that actually traps and holds moisture. Get underneath and scrape off the old loose stuff so you can see the whole picture. You also have drain tubes at each end of your windshield and back window to drain away condensation and leaky gaskets. The tube should run through holes to your inner fender. If the tubes are dry and broken then the water will drain down onto your floor. When you find major rust problems you have to find the cause of problem and address it before you can consider a repair complete. The lower window trim has mall screws in each end. If you remove the screws you should be able to slide the trim off. Good luck
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