"My mother-in-law taught me to wrap Christmas fruitcake in cheesecloth soaked in grapefruit juice.
She would make one for her 7 children and 13 grandchildren every year.
After trying different things back in the day, even trying a coffee wrap, which didn't work very well, she settled on grapefruit juice. This is great for a non-alcoholic family fruit cake! Some mild fermentation will already exist in the cake from the fruit."
Pour grapefruit juice into a large bowl and add cheesecloth; allow to soak. Wrap the cake in the grapefruit-soaked cheesecloth; wrap again in 2 layers of aluminum foil. Store in a cool place for up to 2 or 3 months.
If you are making the fruitcake from scratch, the Festive Fruitcake I recipe works well. I like a recipe with some fresh-brewed coffee added in. If you are using a freshly baked cake, allow it to cool before wrapping.
Baking 2 or 3 months ahead is best, but not required if you use a store-bought cake.
If my mother-in-law was out of cheesecloth, she used paper towels.