I've actually had Techron make a gunked up carb on my Stihl chainsaw run like it had a complete cleaning, after adding it to the fuel, running the saw a while, and leaving it overnight. I'm sure it has limitations, and I'm sure it can't come close to doing what a thorough cleaning can do, but it's the only additive I've ever used that really made a difference.
Other products that contain the active ingredient like Redline SI-1 are undoubtedly as effective.
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