Any Professional Carpet Cleaning Dopers?

An employee of mine took out an oil fired boiler and didn’t use drop cloths.

As you might expect, part of the carpeted basement looks like coal miners have been using it as a thoroughfare.

I’ve got a fired up customer who’s looking for me to recarpet the whole basement if I can’t clean it completely.

I don’t want to guess. I’ll take suggestions from all before I begin------with a bias in favor of those who have professional experience in this field.

Help!