/diy/ - Do It Yourself

I started stripping down a GE fridge to replace a rusted out part (that takes icemelt from the evaporator and directs it to the drain), and I found fucking black mold all over the evaporator cover, which is mostly fucking styrofoam. See pic related.

So a couple questions.
1. How the fuck do I clean this? I thought about using bleach but my mom balked because she's afraid the vapors will persist and contaminate foods (she is super sensitive to foreign smells, etc. giving her butter an off-taste). I saw another recommendation from Sub Zero that they recommended using one part bleach to three parts water and cleaning with that.
2. I want to avoid replacing the evaporator cover. GE only sells the styrofoam as part of the complete unit, which includes two fans and a few molded plastic covers... lowest price I've found is fucking $200. Cheaper than a new fridge but we want to avoid that. But if I bleach up the foam is it going to impregnate the thing and leave the fridge stinking of bleach?