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How do I remove white crusty stuff on aquarium equipment?

Good morning,

Hope everyone is enjoying their extra hour of sleep.  

I recently received some older aqurium equipment.  A nice biowheel and a few
powerheads.  All the equipment has a very hard white crusty layer on it. Most
of the time just above where the water line would have been.  I first tried to
bleach it off.  That didn't work.  Then I tried vinegar.  That didn't work.  I
tried to chip it off with a chisel like tool but that only cut into the
plastic.  This stuff resembles salt creep but I know it all came from a
freshwater aquarium. 

Does anyone have a good technique to get this stuff off.



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