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I once spoke with a nurse who said they have the walls scrubbed on a regular basis. I can't recall if it was daily or weekly, I think weekly.

They're not paying the nurses to do that, the people who are doing it probably consider it shitty work and I wouldn't be surprised if things get missed due to the sheer crappiness of the work.

I think there's probably a reality there that can't reasonable worked around. Sure, in theory a perfect scrub will solve the problem but how do you regulate that into effectiveness?

The best you can do is to design tools to make it less shitty but you'll never make it non-shitty.