Firewater is an amazing commercial pre-spray. Firewater cuts through tough grease and oil but you will find it even more effective on fine particulate soils like that sticky clay/soil found in some areas.
Shake well before use. For normal light soil dilute 50 to 1. Increase your concentration as needed for heavier soil. All Injection Sprayer dilution ratios assume sprayers are set at 8 to 1.
Using a dilute solution of Fire Water pre-spray heavy soil areas of carpet and agitate gently to emulsify and suspend soil prior to hot water extraction.