All- I recently purchased a 1929 Model A town sedan that had been sitting in a barn for 61 years. Needless to say it was dirty. I washed the car and vacuumed the inside out. The upholstery even though vacuumed still is dusty dirty. What could I use to give it a good cleaning so that you could feel good about sitting and driving in it? Would today's chemicals harm the old upholstery? Ralph