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I'll just leave this here:
Hygiene associated with the product has been questioned in research by the University of Westminster Trade Group, London and sponsored by the paper towel industry the European Tissue Symposium
It's ok to be cautious, but if the data is accurate then it doesn't matter much.
Also, how is their research any worse than the one sponsored by Dyson, who is trying to sell overpriced hand dryers.
Anyone who has ever seen one of these more than a few weeks old knows how disgusting they get because cleaning crews were never trained to clean them. I'm assuming that isn't considered in Dyson's version of the research at all. There's one in a bathroom in my area that is covered in mold.
In both cases, it is the instance of conflict of interest and a moral hazard. Tainted and not to be trusted.
They always look clean in the malls I see them in.
That's great, probably better for life happiness to just not look very closely, and ignore research like this. I doubt anyone is getting sick, even if it is certainly spraying stuff around.
Actual science is always good, but I'd like to see data on them with hourly vs daily vs weekly vs monthly washroom cleaning, and the same data on regular hand dryers and as well as paper towel.
Bet the airblades are best with a quick cleaning cycle, and worst with a slow cleaning cycle (except for paper towel if the cleaning cycle is slow enough; 'no paper towel, dry your hands on what you can' is certainly the least best option)