We took seats out. We had a brush we used surf to clean seats with brush. As my car seats have lather covering on them. If your car has lather seats so you can try it.
about chemical i dont know exact name but it was some lather cleaner, And about carpet. I didnt took carpet out. But we used Vacuum Cleaner to clean it then we used a bit wet cloth then a dried cloth to clean it properly.
And we used a wet cloth to clean the space under seats then we used a dried cloth.
But job well done as it was done by Professionals.
At most of interior first it was cleaned with brush and surf a bit. The professionals know hot to do it. Then with cloth. Then chemicals.
CHEMICALS are applied only on clean surface. First they clean then apply chemical.