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iFixit wants Congress to let it hack McDonald’s ice cream machines
(www.theverge.com)
This is a most excellent place for technology news and articles.
There's a 4 hour heat cycle it has to go through as part of the cleaning. In addition, the machines are apparently very temperamental and throw errors a lot, but the error codes are (arguably intentionally) obscure so typical employees just aren't going to know what's wrong with it. Also machine servicing is done exclusively by the machine manufacturer, so if any work needs to be done to it they've gotta schedule a tech call-out.