Hello and happy new year to everyone!

I've been trying to solder some sterling silver wire to copper sheet, on one of my pieces I've used too much solder and it has overflowed onto the surface of the copper. Pretty please could someone give me some advice as to the best way to remove it, sandpaper doesn't seem to do much but I'm not sure about filing either? I'm worried about mucking up the surface of the copper as the solder is quite a thin layer that has spread a long way!

Thank you