Just found the following on their website. Never used it myself. I'd recommend cleaning your own with it before a customers.
"Karcher RM760 Press & Ex Powder 10Kg Tub 6.295-570.0
An excellent all round cleaning powder for use with the Karcher Spray Extraction machines. This is far superior and more economical to use than many liquids. Widely used by both valeters, cleaning companies and hire industry. This tub will give 100 fill-ups of a Puzzi 100 or 200 machine!
Properties:
Classical basic cleaner for spray extraction of all textile coverings & upholstery.
Removing grease, oil & dust
Very gentile to materials
High cleaning activity even for low temperatures
Improves the hygiene of the floor
Contains no bleach or optical brighteners which can damage fibres
Easy to store and to handle
Surfactants biodegradable in accordance to OECD
pH value in a 1% solution apprx 8.
White powder with a fresh odour
Fields of application:
Motor vehicle shop Interior Cleaning
Vehicle reconditioning Carpet & textile cleaning
Processing:
Spray extraction machine: 1+99 (1%) dilution up to 60 deg C
Rinse with clear water after cleaning.
Economy:
1Kg RM760 powder is sufficient for a maintenance cleaning of apprx 100m2 diluted at 1%, medium soiled carpet with a spray extraction machine.
NB:
Allways test colour fastness
Do not soak floor coverings
Store frost free
keep out of reach of children
Alternative:
RM764 press & ex liquid".