Hi Armilite! What happened to your whetstone? Is it steel dust? Oil?
If it's just steel dust, dry the stone out and put some 220 grit sandpaper on a hard, flat surface. Rub the whetstone over the sandpaper until it's flat (make a light grid on the face of the stone with a pencil and when it's all gone, the stone will be flat and should be clean as well).