Imo all hands on V6 suffer from this! I think it is due to the hands recieving a relume to match the New better coloured lume on the dial.
It kind of didnt bother me, but it is a shame nonetheless :/ The hands are really great aside from that, though. Really 3D looking.
But to OP - do NOT try to open it up and remove the spots. It is NOT dust, but a result of poor drying conditions when the lume was applied.