Vaseline will break down plastic.
eventually.
About 10 yrs ago I bought one of them giant jars at Costco. I put a plastic knife in it for application. I now have a flexible knife. I don't recall seeing any cracks in it though.
on the same note. I use to use vaseline to mark off portions of plastic models that I didn't wan't painted. I put some on a hood of a 1/8 model camero. Forgot about it. I had also added a lot, about a quarter inch thick worth ( i was 10 didn't know any better) forgot about it for the summer, when I got back to it, the hood had vacu formed itself around the wire I was using to prop up the car.
In my experience it just depends on the type of plastic as to how long it takes to break down. I would imagine that you'd be getting rid of the MB long before the socket broke down. They're made of pretty hard plastic.
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