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get a jug of CLR, fill a bucket with water and a bunch of CLR (read directions on jug), let that shit soak. its basically mineral buildup from people using tap water instead of Demin water, and just being 300 years old. its very very common, I've seen way worse than yours,
clean with wire wheel and wire brush.
use only demin water, not tap/hose water, add coolant as necessary.
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