Great combination of items for anyone that needs to do some basic maintenance to their bike. It comes with the citrus-based cleaning fluid (bio-degradable), a chain/gear brush for cleaning out the debris and dirt collected, and of course the chain cleaning kit.
All the items in the chain cleaning brush kit are easily removable for seperate cleaning and parktools also sell the items individually once they wear out.
For first timers it might seem a little difficult to use but after the 2nd try it was easy as pie. WARNING the cleaning fluid will leak out from the cleaning kit as you have the brush and chain carrying the cleaning liquid out. You may want to lay out some old newspapers on the ground before starting this.
I've cleaned my bike chain a few times now. I think one bottle of citrus cleaning is good for 3-4 cleaning rounds before you have to buy another one. I've used the citrus liquid to clean my gears as well to get rid of the grease in other areas of the bike. The smell of the cleaning liquid does linger around for a day or 2 if you just leave your bike, but it goes away once you take your bike out for a round.
You may lose a few bristles from the cleaning kit as you are cleaning your bike chain as the chain catches the bristle, but i've only had 2 or 3 bristles being pulled out each time I clean the bike chain so it's not such a bad thing.
There's an instruction sheet with the whole kit, comes in English, German, Japanese ... and other languages.