Cleaning the deep freezer maintains a safe food environment and fresh smell. More importantly it improves the efficiency of the freezer. The time to complete the job depends on size and amount of food transferred during cleaning. No special cleaning fluids are needed, just regular household items.
Follow the manufacturer's manual for additional procedures and to see if your deep freezer needs defrosting before cleaning.
Allow any inside ice buildup to thaw and remove excess water from the bottom. Use towels to absorb the water and wring them out in a bucket.