Got my very dirty TOM pf squeaky clean and the first patch of wax is currently drying. Didn't even need Novus to clean it, just rubbing alcohol and a microfiber cloth.
It scrubbed the dirt off very well, with no ill effects.
It seems it also scrubbed a layer or two of skin off my fingers.
I guess the moral of the story is to wear gloves when working with microfibers.