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!