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I never gave it much thought about what is in those things but I would guess something ethanol based. They all claim cleaning properties and probably swell up seals which is what alcohol does. If you ever put a rubber o-ring in a container and spray some carb cleaner or the like on it, you can watch it swell up. It must be something similar that still has lubricating properties in it. Actually if you put rubber seals in diesel they get softer and swell a bit as well. Just to be clear, I am just speculating as I don't actually know.
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