Fungus gnats are ubiquitous to houseplants. They are annoying. They also practice parthenogenesis, so they can reproduce ALL the time and don't even need to mate.
Regular doses of half strength malathion in your watering mixture will get rid of them..,
Much more effective than the soapy water thing.
The soapy water will only get rid of the ones that you contact with the solution. THe larvae, eggs, and pupae will survive in the soil pretty well through any soapy drenchings you give them.
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