Pre-spraying with or without scrubbing???

[Bernd]

I thought a lot about the difference when pre spraying the carpet and giving some dwell time. What is more effective on heavily soiled commercial carpets?

1) Just to spray with a battery or pump up sprayer...let dwell and then clean or

2) Spray with the onboard sprayer of my Orbot while scrubbing with a fiber pad...give some dwell time and then clean with a Microfiber pad or SuperZorb?

What works best for you?