I cleaned the contacts and the leads with the brush and blew away the shavings. Then using a cotton-tipped aplicator I applied a liberal amount of dielectric grease to the terminals. The internet gave me some direction:
At the high points they touch, and at the low points there are gaps. Dielectric grease will get smooshed in to the gaps, keeping out moisture and electrolytes.I applied way too much, but no matter.
Subaru's battery compartment comes with an insulator, so I did not install any additional cold weather gear.
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