I put 300 .38Spl HSM LSWCs downrange a couple years ago and don't remember them being overly dirty or exceptionally clean, but the cases were both bare brass and nickle plated with several different headstamps and a few were marked +P.
The cases reloaded okay, but found a place that sold .38Spl LSWC loaded in new Starline brass for 3 cents less per round, so I didn't buy any more HSM.
John