I have two skulls that were bleached and I thought they came out fine. I like the clean white look even if they're a little more brittle... They could have used a special cleaner but I thought it was bleach. When you're done I also recommend getting a cheap mounting bracket to hang your skull on the wall. Using the old nail or clothes hanger method is unreliable in my experience and doesn't look as nice. If you spent the time cleaning it up you might as well spend 20 bucks or so to hang it securely. Heads of State Panels has the best in my opinion, it's called the Head Hanger. Here's a Javalina I had done, also on that bracket-