I am trying to find out the best way to neutralize unwanted odors from my interior and in return generate a lasting scent from my cleaning products. The odors are not that of food or sweat, but almost more of a grease type smell, as if the car has been left in a mech shop with the windows down, it is my project car which consists of a 99 GT shell (ive owned since 2003 with 48k miles) with a swapped 03 cobra interior. I noticed the odor change once i installed the 03 seats and the headliner from another wrecked 03 cobra. The seats are pretty clean and were not in a flooded car etc, nor was the headliner, but the smell is not as desirable as my clean 03 10th convertible with 33k miles (which still smells new). Any tips on to how I can neutralize the odors and allow my cleaning product scents to be more prominent? I am going after that clean new car smell.