I have a client whom had a friend vomit multiple times while sitting in the back seat area of a quad cab Ram truck. I vacuumed, wet the surfaces, went over with Folex, let it soak and did the regular interior detail, then scrubbed the folex areas, wiped with microfiber, went back over 2x with a stronger APC cleaner (greased lightning was what I had at the time diluted of course) and then rewiped with a microfiber, wet the carpets and upholstery and scrubbed a second time, extracted, and then a final wipe to dry. I also went over about 3 times with a steam cleaner as well. I dug under the seats, in the hinges, in gaps between the seats, and everywhere I could see and smell funky matter. It was a very clean truck to begin with yet I still managed to be there for about 2 hours. Its now been a few days later and the client is saying he can still smell the vomit and that there's a slight whitish stain on the front of the back seat in one spot; its the spot where the friend had their head laying when the incident occurred. What else should I try?