Steve
I once pre sprayed Activator on the top edge of a cotton upholstered sofa (the hard to clean part of the frame where it gets a lot of hand soils) and rubbed it with a hand mitt, the result was fantastic. As the previous post states Activator will be effective in cleaning upholstery but I only used it as an emergency back up if I had nothing else to use, being neutral I can't see it doing any harm.
Regards
Nobby