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Transfer the dried coffee grounds to an old metal container or shape a bowl with aluminum foil to hold them. The container should be fireproof and safe for burning.
Burn the Coffee Grounds:
Light the coffee grounds with a match or lighter. They will not flame up but rather smolder slowly, releasing smoke that is unpleasant to flies and mosquitoes.
Monitor the Burn:
Keep an eye on the smoldering grounds to ensure they are safe and controlled. The smoky aroma will begin to spread, acting as a natural repellent.
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