Hi Graeme
LM cleaning solutions can sometimes be a bit misleading when it comes to claims re. containing a protector.
There are four basic groups of protector:
Soil Retardents: Repel dry soils only (often Cationic)
Silicone Stain Repellent: Resists water based staining only.
Flourochemical based: resists dry, water and oil based soil
Stain Resist Overspray: contains acid dye blockers and a flourochemical treatment as above. (Usually factory applied)
I can't report on most current formulations, but some years ago when I made specific enquiries, the general rule was that shampoos and LM formulations containing protectors only had resistancy to dry soils, so offered no STAIN resistancy at all
I would advise making enquiries of your chosen products prior to "selling the concept" to your clients.
Safe and happy cleaning
Ken