Sounds like you need to try (conduct a trial) without using Clinell* wipes, Richard; just wiping with a dry tissue before putting the probe into the Trophon unit.
More about Clinell
Meanwhile, Trophon units certainly seem to be "the answer" for probe disinfection. Am I right in assuming a wide (popular) up up-take of these machines? Does it have any competitors? And are on-going costs (cartridges) within sensible bounds?
I'm also wondering if there is anything like Trophon for endoscopes?
* Is it possible that the Staff could be using some other techniques (products) as well? Tristel, for example.