Score the surface of the ham in a diamond pattern about 1/8-inch deep. Place cloves in the middle of each diamond. Place the ham in a large roasting pan with a rack, tent it with foil, and bake for 2 to 2/12 hours---or longer, depending on the package directions.
In a saucepan heat the brown sugar, mustard, vinegar and soda in a small saucepan until boiling. Cook until reduced and a bit thicker, approximately 15 minutes.
After about 2 hours of baking time, remove the foil and brush the glaze on the ham in 20 minutes intervals (put the ham back in the oven, uncovered, in between) until it's nice and glossy. Remove from the oven and allow to rest 15-20 minutes before carving.