Dave from Pristine Clean had commented you can loose face with a job like this, This is quite true. we took a job on a few years ago which sounds simmilar. A school had asked us to clean what she described as an Altro floor and spruce up a carpet which was completley knackerd, held together with gaffer tape, full of holes and builders dust. Out of keenness I accepted the job and could not get rid of the stains on the Altro (type as it turned out) and she had expected the carpet too look as good as the day she bought it. What I would do now is say no or be completly honest if I wasnt sure I could do the job, because that caused me alot of problems and much of it is in your own mind as a small business.
since starting the business I have had loads of problems and some of them actualy happend