you can clean car upholstery on the cheap + do a great job, just liquid tide laundry detergent @ 50% in water, scrub both ways with a sponge being sure to saturate material + vac as dry as possible + fan dry the rest as the foam holds moisture. i did this yearly in my very light tan 2001 jetta interior as windows were usually down. a lot of work but its interior looked new after 10 years + 200 thou on the clock, sometimes 200 miles daily for building construction work!!! of course best done in summer but setting in hot sun still wont fully dry as witnessed by water droplets on the windows. i put 2 good fans on it overnight in my shed, worked every time + it smells great ever if a smoker but i am smarter than that!! i started on the headliner down, you can see clean spots from the drips doing the top as noted several hours of my free labor!!