Had some mold (or mildew?) above the shower in my bathroom. Black spots on the wall. Mold Armor cost me about $4 for a 16oz bottle (if I remember correct). It says "Instant Mold & Mildew Stain Remover". I didn't realize it actually is instant. I sprayed it on, walked to the kitchen and back and it was freakin gone! I really was amazed.. what a "WOW FACTOR!" this product has.
The only downside is it's pretty potent, so you'll want to make sure you get it sprayed pretty quickly and come back in 30 minutes or so. I left that vent fan thing in the bathroom running. I'm in the next room over and I smell it. I'm going to go open the windows and might even go outside.