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Dust? You MTB right? Dust shouldn't make them squeal. Blow them (lucky wheels) instead of wiping.
disc brake cleaner
FYI: isopropyl alcohol in bulk is cheaper than the sprays if you're not already using that.
Another option is to run metallic pads all the time anyway. They already squeal so you just get used to the Built-in Pedestrian Warning System™
hippy
pascalo
One thing that might play into this is that when you get the other wheels out they've been gathering dust for a while, i.e. in my garage where the car drives in and out as well.
Then proceeded to brake that dust into the pads the first 20 mins of my ride, et voila, squealing brakes.
So now I always make sure to rub the rotors down with disc brake cleaner when swapping in wheels.