Oil, curry, ink, blood, rust off a balcony rail and the orange that drips off a drying line are the five we see every week, and each one needs a different thing done to it.
A stain is looked at under a lamp before anything is put on it, and you are told what it will cost and how likely it is to come out. Between fifty and two hundred depending on what it is and how long it has been there.
We will tell you honestly when the answer is that it is not coming out. A garment that has been through a hot wash and a dryer with a stain already set in it is usually finished, and paying us to try three times does not change that.