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Another very effective trick is to prepare a real silverfish trap . Pour some oat flakes into a jar, which you then wrap with tape. The starch in the oat flakes will attract the insects, which will climb onto the jar to enter, but from where they will no longer be able to get out, sliding on the glass.
If you can spot a silverfish nest, simply pour a little ethyl alcohol on it to eliminate it.
Remember that silverfish like humid places, so if possible, put some baking soda in a jar so it can absorb some moisture.
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