Those brown bumps on stems are scale insects, and their shield keeps most sprays off. Here is why, and the scrubbing method that actually removes them.
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Mealybugs return after a first clean because they hide in four places a spray can't reach. Here is where to look and a four week routine that clears them.
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The small flies around houseplants are a fraction of a fungus gnat infestation. The rest are larvae in the mix, and that's where treatment has to go.
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Aphids come back after one spray because the survivors mature and breed within a week. A treatment sequence timed to that cycle clears them in about three weeks.
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