I use Jizer as a chain cleaner and then a bit of Jizer to clean the cleaner, especially the sponge.
That's the stuff.
It looks expensive but you don't need much so a tin like that will last years.
I would say it's stronger in that its surfactants will start to break down the heaviest grease on contact without agitation or hot water so keep away from bearings. Put some up to the line in the Park tool, give it a few spins and rinse off with cold water for a completely clean chain. I do use some sparingly on a paint brush to clean the chainrings and cassette as well.
One of my first jobs out of school was using it to strip the grease off of industrial hydraulics.
Does logic not suggest that the same stuff that cleans the chain, will also clean the chain cleaner - or am I missing something obvious..?
Don't Park do a chain cleaner cleaner? Surely there's a gap in the market they can exploit?
He's right you know.