+1, although Leatherique say that PC leaves some protection behind, it's main role is to clean the RO from the surface.
After this PC can be used as a maintenance cleaner.
Also I think you would find it quite hard to remove RO without PC as it becomes quite thick & sticky.
When I used it I let the RO soak, sprayed the leather with PC, agitated with a soft brush, wiped with a hot, damp towel then dried with a clean, dry towel.