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Today I cleaned window seals as you described and added some insulating foam and tape around the hatch brake light fitting. I also opened the hatch tail light interior covers to find skimpy patches of sound insulation . I added insulation here also. I am just back from a 100 mile drive and I must say that the back of the car seems quieter.I know that this perception can be affected by hope and expectation.
It would be interesting if someone on this board who has access to a Sound Level Meter was prepared to carry out before and after measurements on the same road in similar weather etc.
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