Bleach

Take 1 quart of water and 1/2 cup of bleach.  Scrub services to kill mold with a soft brush until mold disappears.  Wipe but don't rinse and make sure you use white!  

A more natural way is to use Baking Soda

Mix 50/50 water and bakikng soda into a paste for lighter mold stains (also helps prevent).  Spread the paste and let it dry. Scrub areas with small brush, wipe away debris and any reidue.  Then mix 2 cups of water with 2 tablespoons of baking soda mix WELL and put in spray bottle, spray or wipe and leave to deopderize and prevent future mold!

Happy Spring Cleaning!