How to clean mold and mildew
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My one and only answer: bleach
Spray bleach is effective
https://www.youtube.com/watch?v=kDAIz8n5kn0
Try a mixture of bleach and warm water. Mix one cup of bleach for every gallon of warm water. Grab a medium-bristled brush, dip it in the bleach solution, and attack the mold ormildew stain. Be sure to dry the surface off as much as possible, as moisture promotes mold and mildewgrowth.
Have you tried Bar Keeper's friend? Its a non-abrasive that works wonders on hard to clean stuff like this.