I'm the fool who didn't wash the snow off his bike - it's a rusty mess.
I've just taken apart the front disc brake as it was rubbing. I think that was more to do with the disc being bent, but as I was doing it, I found the disc brake pads (?) are pretty rusty. This is what they look like:
Should this concern me at all? Can I clean them up, or should I replace them? Or are they fine just to be left?