What are the real differences between the specialty black powder solvents that are advertised and other general purpose gun cleaners like Hoppes, etc. Or about soap and water?

I can't imagine that soap and water would put a dent in lead in the barrel, but Hoppes does and other lead solvents claim to.

I am asking because I am about to order my first rifle (and stop borrowing friends) and the 'starter kits' often come with the special cleaning stuff but it adds to the bottom line.

Experiences?

Chubber