...Leaves lubrication behind inside the rollers.
What, diesel, or white spirits?
Diesel is an "oil" white spirit is a "solvent" - so diesel.
Have to say the gadget looks pretty wasteful in the way it sprays. A look at the website and other products suggests that it's a bloke in his home with a 3d printer making a few bits (probably to order?)
. . . I've used one of the "clamp on reservoir and brushes" chain cleaner in the past but nothing really works as well as taking the chain off the bike - I've moved to using my ultrasonic cleaning tank with a weak degreaser solution and then waxing the chain in a slow cooker with a mix of wax and PTFE powder (one chain on the bike, one being cleaned/waxed ready to swap out to rinse and repeat)