what can I use to get mold out of pack n play?

I bought a pack n play used & it was in perfect condition, I decided to clean it by soaking it in the bathtub in laundry detergent, baking soda, and white vinegar. I let it all air dry in the sun (since the sun is a natural sanitizer). After cleaning it and it was completely dry I packed it all away until closer to my due date.. I got it out yesterday & on the mattress part it has a very small spot of mold. I'm just wondering what I can use to get it out.