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A foam air cleaner should be cleaned using:

  1. Ammonia

  2. Kerosene or liquid detergent and water

  3. Vinegar

  4. WD-40

The correct answer is: Ammonia

A foam air cleaner should be cleaned using ammonia because it is effective in breaking down and removing the dirt, oil, and debris that accumulate on the foam. Ammonia helps to dissolve the contaminants without damaging the foam material, allowing for thorough cleaning of the air filter. Options B, C, and D are not ideal choices for cleaning a foam air cleaner. Kerosene or liquid detergent and water can leave residue on the foam that may affect its performance. Vinegar is not as effective in cleaning oil and debris from the foam as ammonia. WD-40 is a lubricant and not suitable for cleaning a foam air cleaner.