When you pull the interior out you can wash all the metal and some of the hard plastic with the bleach, but I would be very care full on plastic and vinyl and bleach.
Look around at the big box building stores, they have lots of safer methods then bleach for fabrics.
There is a product at the Home depot we use in my biz and it is called mold control.
It kills and seals mold, it has worked for us and has been passed by building inspectors.
Try it, it can't hurt like bleach will.
I used Mr clean on the hard fabrics like seat belts and stuff with lots and lots of vacuuming, then the mold control on the carpet both sides.
It worked pretty good for the time I owned the car. Head liner is the toughest part, easy to stretch or tear if your not careful.