Humminguru S-DUO

I'm as nervous as the next person about water or any other fluid getting inside a cartridge. But with great care only the stylus and the tip of the cantilever get wet with this device. Here is a nearly new Cadenza Bronze (6 hours play so far) that has been brushed with a carbon fibre stylus brush:

and here it is after 20 seconds in the S-DUO:

And I was even wondering if the device did anything! Looks like it does.