Originally Posted by emma69

The oranges are not generally washed as far as I know. Or, put it this way, when the people who own / sell the machines (Zumex? I may be imagining the name however) provide training for restaurant staff on use, they do not tell you to wash the oranges first. Given the semi-open boxes of oranges sit on the floor of the wholesalers, on the floor on the lorry transporting them to the restaurant, close to the floor in the restaurant walk in fridge, being dropped on the restaurant floor, which is likely mopped at least a couple of times a day would be the least of my worries.

Those same conditions exist in the US and Canada too - and I don't routinely come across restaurants (or home cooks) who thoroughly wash the outside of an orange before juicing it - a quick rinse won't get rid of anything of consequence (it doesn't matter waht the machine is or does - the simplest version being a knife - if it touches the outside of the fruit and then the inside, the contamination risk is there.)

Oh, and knowing all this, I still have zero problem drinking the juice from these machines, and use to on a regular basis.