its possible that its power steering fluid, i would check that out. thats the only other green fluid i know that exists. if it were a coolant leak, it would def be pink. sometime dries up white on parts that gets hot. and a purplish pink color on the skidplate is from leaking motor mounts, which is common on the passats. really easy to replaced, but really expensive at the shop. i used to love doing them. good money makers. haha.
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live for dubs. love it!