Advice needed please. Parked the new-to-me CLK nose down on the drive last night, and it threw it down. Drove away this morning, and as the car moved, a pint or so of water sloshed onto the passenger seat (luckily, her indoor was still...indoors). Water seems to have come from the plastic covering just above the windscreen. I am suspecting a blocked drain tube, but can anyone give confirmation, and advice on where/how to access this and unblock it? Cheers all.