I'd avoid the tobacco. Can have tobacco mosaic virus in it... I'd just use a mild dish soap (a few drops in a liter of water) and spray with that. Get all surfaces of the leaf.
I really don't have anything to judge your light levels by, I'm sure they are far higher than mine. I'd start with the heavier shade and experiment with moving it to the lighter shade. If the leaves are dark green, it isn't getting enough light.
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