Janice's Mom's 7-Up Ham Glaze

This is my mom's recipe, and I always use it.

Remove ham from oven 30 minutes before done.
Score ham and stud with cloves.
Pour over ham:
1 (12 ounce) can of ginger ale or 7-up over ham
Then pat on the following mixture:
1/2 cup brown sugar
1 tbsp. flour
1 tsp. dry mustard

Return to oven - baste frequently for 30 minutes.