That's what I'm experiencing. All four of my sunroof's drains have been cleaned and flushed using a combination of water, weed eater cord, and compressed air. Still, after I wash the car, I still get water dripping into the cabin. The drain system is clear, why do I still have water coming in?

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.