Update, for S&Gs I cleaned the pins in-place with some cleaner and a toothbrush. Seemed to get rid of the gunk. Took the car out on some errands, tried to brake hard a few times. Seemed like it started to improve but probably just an illusion, but maybe not.
When I got back to my neighborhood where there are high curbs, I was hearing a cyclical squealing that went away with brake application. Seemed louder when turning as well. Didn't notice it when I first left. Couldn't tell which wheel it was coming from.
Snapped a quick pic of each, not great quality but maybe helps in an expert's eyes. Pardon the wheel rash.
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