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I wash my car weekly in a TCW all winter long and have never had a single leak. Occasionally, I will hand-wash it with a high-pressure sprayer in the winter, but I don't linger over the seams. Unless the TCW you have directs high-pressure spray over a period of time onto your car, I'm not sure I'd consider any leakage normal. I'm going by my own experiences over 3 different convertibles, but the hard-top should be the tightest.
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