Why is my dusters glove compartment full of water?

nobodys saying the dams don't rot out, ( I'v replaced bunches of them myself in my shop over the last 38 years) I just highly dought the water he's getting inside his glovebox is from the cowl dam, as it is to far forward of the glovebox. Like I said, the best way to find the problem is to remove the glove box liner and look around a little with a flash light while somebody sprays water on the outside.