just had one like this on Friday. Just imagine 1900 sf of shag that looked like this. I very rarely run into anything that bad but it was from a referral generator realtor.
1. rinse with wand. You would be surprised at how much dirt a good rinse will remove. remove as much soil as possible and your prespray will be that much more effective at removing the rest of the soil. Make sense?
2. apply a powerful prespray.
3.
CRB slowly in both directions
4. rinse
repeat steps 2 3 4
Carpet looked pretty close to new.
already ahead of you.....if I dont have pictures, it never happened. Well it did.