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If you feel the need for extra protection use body cavity wax. This is applied from factory inside doors, rockers and 1/4 panels. You can see it on all light colored BMWs as dirt stains on front and back of rocker panels. It is more stable than oil and dries to the touch. Much less messy and designed for the job. It has a long wand applicator and can be sprayed through any hole. 3M makes it as well as others.
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