I combat clogged drain tubes using a clean dowel or BBQ skewer to prod and fish gunk out. While I'm doing this, I am allowing a small amount of water to drain through so I can check the extent of the clog and loosen up the crud. Obviously, if your drain tubes are torn, this is not really an option and replacing the tubes seems to be the best solution.
If your hatch seal is gone, replacing it is the way to go, but it's a bit of pain as the piece is pretty big.
Good luck.
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