illustration of hands brushing a spark plug with a metal wire brush
Illustration: John Kachik
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Spark plug maintenance

Spark plugs, found in gas-powered tools, ignite the air-fuel mixture that gets the engine going. They get dirty with repeated use, so remove them with a socket wrench, spray the large ends with brake spray cleaner (available at automotive shops), and scrape off the carbonized black bits with a stiff wire brush. If the plugs are too dirty to clean, simply replace them for about $2 to $4 apiece.
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