For dirty chains rather unsuitable

The idea is compelling. Just one device on the chain of clips rather than expand.
With clean chains the device may also operate.
In my case, the chain was eingesaut for two months in continuous use and correspondingly deep black.

The supplied cleaning liquid is gone after about 1 minute from the device. But the chain was still pitch black. So the chain with cleaning cloths had to be processed again.
Then oil should be poured into the tank with the now totally eingesaut bristle wheels. The prisoners in the bristles dirt is thus applied again to the chain when oils ...
It would be better to use a second, clean the device for the application of the oil.

Much better but is the old method: Remove chain, insert overnight in gasoline and then with grease grease again (no oil!). This is cheaper, cleaner and lasts much longer!