I did a Section 8 rat hole last September. The landlord told me the tenant didn't even own a vacuum. It was a commercial berber style carpet. She told me she was vacuuming with her $30 lightweight, but it wasn't enough. This is why she called me. I pre-vacuumed with my Sanitaire dust cup machine. I filled a 13 gallon tall kitchen garbage bag with dirt, hair and I don't even want to know... The dirt formed mats on the carpet. I cleaned it like the nut that I am. I was putting about 16 ounces of mint quat into my rinse tank per 12 gallons, just so I wouldn't gag on the exhaust fumes of whatever nastiness I unearthed. As per my usual, I scrubbed the traffic lanes. This had a ground level entrance, but the unit was actually the 2nd and 3rd floor. I cleaned the first flight of stairs twice. Because everything was Olefin, I used the 13.2pH pre spray/bonnet cleaner. 2 oz per gallon overall, 8 oz per gallon on the spots, stairs and traffic lanes. She specifically told me she was not going to pay extra for any stain cleaning (there was red kool aid) but just the standard cleaning. I'd say the kool aid was diminished by 75%. Same with the bottom stairs. Seems to have rust stains but I didn't investigate. No matter the job, if they pay for deluxe cleaning, I clean all edges with an upholstery tool or my crevice tool. This home was built around 1900 and remodeled about 1990. There were no soot lines. I thought it looked great. Smelled 100% better too. She went nuts on me. In the closet was a 500 watt work light left behind by the painter. She used this to inspect my work. She beat my head in. I said to her I wasn't interested in redoing anything, but would taking $40 off a $200 job make these problems go away? You bet they would. It was getting late and she wanted to get out of this neighborhood before the whores, drug dealers and gang bangers took over the streets. Me too. More often than not, it is just a way to beat down the price.