Chevron Techron Fuel System Cleaner | $7 | Amazon
Photo: Shep McAllister
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Chevron’s Techron fuel system cleaner claims to clean, restore, and protect the entire fuel system in your vehicle, and judging by the glowing user reviews, it really does seem to work. Amazon will sell you a 20 ounce bottle today for $7, within about $1 of an all-time low.