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If your environment contains ferro-magnetic dust you should probably be more concerned about inhaling that stuff.

Not dust, just macro-scale but small bits of crap.

I think some of it in my bag is from a black sand beach. That stuff kills headphones as well as wonkifying magsafe sockets.

I took a bag to the beach, then put my laptop in that bag a few weeks later. The leftover sand (because sand is basically glitter) had some magnetic bits, which clogged the magsafe connector. I had to spent like 20 minutes with a toothpick to get enough out to charge, and it was never quite back to normal.

Not to be a dick here but I think you're in a minority. I dont think many users are going to run into this issue.

Strong adhesives are often a good way to defeat magnets. (I've used this principle, but not in the specific context of removing magnetic crud from inside a magsafe plug.) A properly designed magsafe power plug would have a way of either easily replacing the plug or removing/defeating the magnet.

Thanks, that's a good tip.