this happens all the time. been dealing with it for 20 years and no matter what extractor you use, if someone spilled a dark liquid in the seat, it will come back up to the surface as it dries. here is what I have always found that works the best. 1) let the seat dry completely (very important) 2) you don't need any cleaner at that point, just something that will absorb, or mop up the stain. the thing that I have found works the best...a wet chamois. not dripping wet, but get it soaked then wring it out and blot/scrub the stain. then let it dry for a bit and do it again. repeat until its gone, usually just once or twice. often times people deliver cars back to the client while still damp, because the client gets off work and needs their car by 3:00 or whatever, and you don't have time to get it completely dry first, then the car dries that night and, sure enough, the next morning the seats can often times look worse than before you started cleaning them. this might very well be the most frustrating and hard to manage thing about the entire detailing process. the seats look great right after you extract them, then look horrible 3 hours later. all that spilled liquid rises back to the top and must be soaked up again.
