Put a pot of boiling water in the freezer and close the door.
Steam is hot and will melt the ice faster than just room temperature. The more boiling water, the faster the ice will melt.
It was recommended that I replace the pot of water every 15-20 minutes. I followed this recommendation and was disappointed at first. However, after about 3 pots of boiling water, I began to really see the "work" that was being done!
***Use caution that you do not melt any plastic in the freezer if the pot is too hot.
After about 4 hours, I was ready to restock!