They are valuable, except for the fact that machines can now do the disinfecting aspect of the job (the most important part) better and faster than they can.<p>See: <a href="http:&#x2F;&#x2F;tru-d.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;tru-d.com&#x2F;</a><p>And to the point someone else made in this thread, they are easily replaced; not requiring a significant amount of training or onboarding resources.