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you have to buy 3M a liquid solvent, usually used for plastic creak.
usually in auto dealer you can find it to reduce noise,
if the sound coming out from the loosen screws, you have better buy a new set of screws (new screws each has a "O" shape thin cloth as a noise reduced ring, cost very cheap in internet, which can help sound reduction)
so first you have to figure out what the sound coming out.
fo your information, my X1 has no noise, after i did several jobs.
sometimes very crazy, for example my wife put a broadview rear mirror, the sound comes from the crack of new & old mirror vibration, but at the begining also i misunderstand its from the dashboard inside. so now i add some thing inside the 2 mirrors, then no sound
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