Today I went to see the job and do a small test to have a feel of it. It is about 450 sqft, last year when the customer bought the house the carpet was clean and I guess the winter brought this dirt on it. I did clean a small area and there is a heavy build up, pre spray and extract won't work, I had to scrap the heavy build up first then then scrub it and then extract, a small area as you can see on the picture took me about 5 min with my mytee lite. I use this machine for small tests or upholstery. what is the easiest way and fastest way to clean this heavy build up? I told Mr Khan before I saw the place it would be $ 300 or more, but even $ 300 was out of his budget, so when I have arrived to look at the job today I saw a brand new porscheon his drive way, how much do you guys think it will take, how much should i quote him?