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If you've taken out the fuse box cover on the W123 you'll realize it needs a specific way to get it out easily. The same goes with the plastic liners. Clean it inside out while you're at it, as well as remove the trunk floor board and carpet to clean it out since there's also another drain in the spare tire well you might want to clear up. All drains can be poked from outside but it's best to clean it from inside, of course.
Check that your fuel filler neck grommet is not leaking either. If it is, fuel can drip into the fender and make its way down the crease between the wheel arch and the quarter panel, into the drain area by the foot wells.
Finally, the rear quarter panel side trim mouldings have little red clips that hold them in, and also prevent water from getting in. Lose one of these and you're bound to get water in the drainage area again.
Just a heads up in case you see dampness collect there once more. Otherwise cleaning should be fairly straightforward.
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