Those who are judging what their cleaned strings sound like also know that they’ve just cleaned their strings, and are almost certainly hoping for a difference – not to mention that they have also introduced several other uncontrolled differences during the string cleaning process (e.g. radical tension transients, slight differences in installation, possible setup changes, etc.), with no way of accounting for their potential influence.
As such, their conclusions on the matter are based on uncontrolled tests, incredibly small sample sizes, and grossly inadequate processes of analysis that are tainted by heavy bias. In short, people sharing their conclusions based in their own experiences with string cleaning is about as good as a set of worn out strings.
Bottom line for me: The forum has no answer worth listening to. A proper study has to be conducted.