[WBrentWilliams]

The machine from 30+ years ago that I regularly took apart and put back together had about 35 user-cleanable parts for the milkshake side and 12 for the ice cream side. The worst part of the ordeal was removing the rubber o-rings They went on easily enough, but removing took quite a bit of patience. The whole process took about 30 minutes, start-to-finish, including soaking the washed parts in bleach -- no dishwasher as the blades used to cut the frozen ice cream base from the inside of the machine would dull and ding causing damage to the machine.

The new machines came in long after I moved on to other jobs. In ideal situations, they re-pasteurize the mix overnight, leading to a drop in 1-2 person-hours of labor.