Deoxit for cables

Really, deoxit dulls the sound?

nope, sorry, I didn’t like the result (dulled the sound for the worse not better) and eventually cleaned it off with flux cleaner using a tooth brush. just checked which one I have, it is the Caig ProGold G5 Connector Enhancer but it didn't work for me. I have most of a spray tin left.

what was your experience?

How can cleaning contacts which, for me anyway, allows signal to get through, dull that signal? Do people actually think signal is transformed by simply allowing it to be signal? Is it more "signally?" 

theoretically it should help complete the mechanical connection and prevent oxidation/etc occurring.  hopefully making the connection even better for current and voltage transfer and over a longer period of time, which is sort of "better or more signally".

I think applying the term "theoreticaly" to a statement of the obvious (Contact cleaners clean the contacts. Who knew?) shows a clear disregarding of irony. Yping, you are an Irony Dodger.