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I wonder if the car was flood damaged in its past? That could explain why there is grit inside blocking it all the time. I remember when I was looking for a 172 and came across one that had rust stains on the side skirts (amongst other issues) I didn't stay there long lol
Take your door cards off and have a look inside the doors, you will be able to see if they are mega clogged on the inside, if they are then they will keep blocking.