This is not a problem unique to our cars, I have a customer with a 3 year old Merc and that has had numerous new lenses under warranty because of the same fault. Maybe rain is wetter these days?
OK. Just taken on old indicator unit to test (using some lateral thinking).
If there is a leak to let water in, the same must apply in the reverse direction, so ...
I took it into the kitchen, filled it full with water (!) and fitted the bulb unit back in. No sealants, no greasing anywhere.
Much to my surprise no water leaked out anywhere until I shook it vigorously and water then came out of the connector socket.
Not a lot each shake, but enough I guess. Everywhere else was bone dry. Half an hour later, still no other leakage.
Tomorrow I'll check the other one I replaced last year to be sure it does the same and then report back.
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