It's an age old problem and not one that's always been readily solved - how do you maintain hygiene without destroying your mic..?
This looks like a pretty simple answer :-)
Can it rock up like Mr Muscle and simply strip years of neglect, sweat and spit from your favourite microphone with just one squirt of the top..? Probably not... but used regularly, yes, it can keep that microphone feeling fresh and clean.
I've treated several mics (Beta 58s and a Neumann KMS 105) to an application of this - of course, it's best to remove the ball / grille and apply it inside and out without needed to drench the mic capsule itself over and over again - and yes, I'd have to say that I have confidence in the product's claims.
Even though it's a small can, it lasts a while and at the very least, it's got to be better than not bothering at all, right..?