Like all room air conditioners, the Goldstar air conditioners have a filter that must be cleaned regularly for the unit to work efficiently.
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Turn off the Goldstar air conditioner unit, and unplug it from the power source.
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Open the fan vent on the front of the Goldstar unit. Pull out the air filters.
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Wet a cloth with warm water and 1 tsp. dish soap to create suds. Scrub the air filter with the soapy cloth to remove any dust and dirt.
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Rinse the air filter in warm water until it runs clean.
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Allow the air filter to air dry, and replace it in the Goldstar air conditioning unit.