I asked a similar question a few months back. Read this thread and the link Glen replied with.
http://www.driveaccord.net/forums/showthread.php?t=78004&page=2
Bottom line I think a number of them are, but if you do some research and read some reviews, find a good product and stick with it. I'm very happy with the Sonax wheel cleaner, I'll never switch, going to try their new Poly Net Shield. If you google Sonax you'll find a Euro version also which leads me to believe they aren't one of the mass produced. With so many folks happy with Blackfire Products, I don't think you can go wrong with them. They have a great marketing program.
http://www.driveaccord.net/forums/showthread.php?t=78004&page=2
Bottom line I think a number of them are, but if you do some research and read some reviews, find a good product and stick with it. I'm very happy with the Sonax wheel cleaner, I'll never switch, going to try their new Poly Net Shield. If you google Sonax you'll find a Euro version also which leads me to believe they aren't one of the mass produced. With so many folks happy with Blackfire Products, I don't think you can go wrong with them. They have a great marketing program.