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I compared this photo with others online and it looks like the spathes that house the flowers.

This is a Polypodium fern species, likely. Turning the leaves over should reveal spore-bearing organs. They are completely harmless, and should come right off with some force.

Unfortunately, your photos didn't make it through. I can't see the issue at hand, but it sounds like white scale insects are causing your issues, including the sooty mold on the tops of the leaves. I'd take this in a multi step process. The first thing I'd do is get all of the scale that you can off. Use a heavy water stream, or use a rag to remove what you can manually. After that, you'll want to treat with your insect repellent, again. This time, a systemic would be a good idea. Fortunately, there are organic options. I can't recommend any brands, but I can say that any organic drench with rosemeric acid is a safe bet.

https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm

https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm