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No, the McDonald's machines heat up any leftover milkshake mixture every night to kill all the bacteria in it, then cool it all back down before the morning. I
by rrrrrrrrrrrryan 5y ago
No, the McDonald's machines heat up any leftover milkshake mixture every night to kill all the bacteria in it, then cool it all back down before the morning.
If it hasn't been run in the last 24 hours, the machine will refuse to dispense ice cream unless you run the process (which takes a few hours).
Non-McDonald's machines work how your imagining: you have to toss the leftover ice cream once it goes bad, disassemble the machine and clean it by hand, then load new ice cream into it.