I would love to help you, but first you must help yourself in order to save your arse and also to get others to help you.
What is the fabric ??
Why do you need to use such a high pH ??
Simply put...................... different fibres respond to different techniques, solutions, agitation and temperatures.
Basics are
Spread drop sheets on floor.
Vacuum all fabric, checking for faults at the same time.
Apply correct pH pre-spray.
Dwell.
Agitate as required with respect to the fibres involved.
Rinse extract, solution pressure & vacuum will also depend on the fabric concerned.
Towel dry & groom.
Inspect.
NOTE::: Some fabrics and spots, it may be neccesary to treat prior to pre-spray.
Knowing your fibres and the limits you can use pH as well as pressure, heat and agitation goes a long way in saving your arse and your business.
Upholstery, as others have wisely pointed out, is a lot less forgiving than carpet.
If you are unsure, do a class that offers hands on experience, non commital scenarios such as you have painted are not much use to anyone in trying to supply a half decent response.
If you care to ignore the basics in cleaning, you may well find yourself owning several usless pieces of furniture.
Ooroo
:roll: