If you want Prochem stuff:
Power burst for a heavy prespray,
Double clean for general use,
Stain pro for most stains,
Citrus Gel for heavy stains, gum, tar, oil, etc
Fibre & fabric rinse,
Liquid woolsafe,
Multipro can be used as a less heavy prespray or as an extraction chemical,
always handy to have a bit of contract carpet deodoriser.
For sanitizing, something like Clensan.