Well what else can i say, this is an impressive little system.
Lets start with Roto Wheel Cleaner™, I like this for the obvious reasons. It cleans engine and rolling stock wheels, Can be placed right on the track to get power. You can also use the clips and use a power pack on the workbench. The other use I like it for is running the loco with the shell off. This makes applying lube to the gears simple and lets it run through top to bottom. I think its well worth the purchase.
I also picked up the Rail Tracker Cleaning Kit™. I like this because I have a number of tunnels that curve. It work well, doesn't take the effort of the bright boy and seems to work as described.