What is the interior made from? If it's vinyl, I use Fantastik, or Formula 409, or Simple Green, or any one of the other degreasers on the market. If any of the parts have mildew on them I use Tilex, which already has a mild bleach solution in it. No NOT get Tilex on any fabric or carpet, it can remove the color.
Do NOT use Armor All or anything else that has silicone in it to clean a car interior.
If it's leather, you will need a good leather cleaner like Lexol, and then a good leather conditioner over that, which Lexol also makes.
No one lives forever, the trick is creating something that will.