Traffic lane question for my Hydrox heads out there

[Duane]

I have the same problem as CleanItGreen on off white California Berber/Frieze carpets with heavy blackish traffic areas. It almost seems like it's oily soil & black from the rubber on the soles of their shoes or slippers. I've tried Hydrox & I've tried Punch,both lightened the areas but doesn't seem to cut it like I hoped it would. I padcap with the Orbot SprayBorg.