Here's what my track clamps look like after a few years of hard everyday use. Look lower into my blog for a picture of these same clamps all sparkly and new. They still work like new, though.
Track on, clamps, track on.Responding to "Tom's" comment. I use the "lift start" or "scratch start" since my foot-pedal is out of commission. Because if this, the arc wanders around and will end up on the clamp as I pull it away, leaving a bit of scorched track clamp behind.