It's like acne on metal. This is on the inside and the outside of window and sliding door frames. It doesn't look like calcium or mineral buildup. It isn't raised or bumpy.
It is kinda unattractive and I'd like to make it go away.
a. Super-fine grit paper on a random-orbit sander?
b. Hazardous chemicals
c. Will it away with the power of my mind?
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