Answer: What you're using is a neem, hot pepper and garlic compound which may be effective against chewing insects, but not necessarily soil-dwelling insects. I'm not sure what the pests are but the best solution is to unpot your philodendron, brush off as much soil as possible from the roots, thoroughly clean the container, then repot with fresh potting soil. Since that's not possible at this time, you might try covering the soil surface with an inorganic material (aquarium gravel, for instance) to both hide the unsighly critters and to keep them from spreading to other houseplants. When the situation changes, you can repot your philodendron.
Best wishes with your houseplants!
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