While similar to "format", "clean" and "clean all" is not the same. They do a more thorough job of wiping a hard drive than a simple "quick format" and "full format" does.
I like to try to make the tutorials as informative and simple to use as I can. Especially trying to make advanced stuff easy to do for all skill levels.
Any feedback or questions that you may have about using any part of a tutorial is always welcomed to be posted in that tutorial thread. We will be happy to help with anything that you may be having trouble with.
I use all of this to update the tutorials as needed to help others avoid the same problem or issue.
Please just let us know.