I think so, iβve had some luck with that, but neem oil, neem oil, neem oil. Try it. I spray it directly on the mold and it disappears and stays away. Its good for gnats and scale and its great for shiny health leaves
So try neem oil!!! Your plant store, hardware store, or online will have it :)
Cinnamon is a good natural anti-fungal. But...if you're experiencing mold AND gnats, that's a sign your soil is staying too wet for too long. Fix that problem, and you'll fix the mold and gnat problem π