This was t mechanical scrubbed either. Fabric Restorer brushed in with a Tampico brush or hand mitt.
Also helps if you are using a tool like the sapphire where you can use higher flow rate (in trigger mode) without over wetting as the moisture is extracted instantaneously.
But most of all it's about apply the right prespray, do that and there is little need for heavy agitation, which can damage the fabric, the proof of that is that scrubbing it makes no difference.
Also worth remembering that sometimes soils like hair oil, grease, blacktop comes off in layers and trying to do it in one with heavy agitation can be destructive.
Simon