Works just fine on the inside. Had to do the rotor rings recently and sprayed the inside down to clean when they were off, looks great and staying nice because those brembos are gone. Didnt snap a pic though cus my phone was in the garage and my hands were covered in stuff from taking parts off.That waterless thing there, you use it as a quick touch up or to really clean the wheels? These cars get the wheels incredibly filthy fast. To clean the wheels face might work but to clean the inside? WB wheels have prominent wheels insides and cleaning them by hand only could get really complicated.
what kinda soap are we talking about, the usual car wash soap that you use when doing the body too? I would venture to guess the ingredients are rather similar, maybe avoiding some of the harsher cleaners I can see but this is essentially soap and water in a bottle. Works well in a pinch if you go out and don't want to fully detail or forget to clean the wheels, spray on wipe off and they look freshly washed.Never spraying any cleaner on my wheels, sorry. Soap n water.