Picked up this product at Walmart the other day on a whim and gave it a try on the interior of my SS. My seats seemed to have an ingrained grubby look that didn't come clean with wet towel and bit of Simple Green. Sprayed this Lucas cleaner on seats, all over the interior, including the floors and walls, and dash. Couldn't believe how nice the seats look as well as the rest of the vehicle inside. Spray on, wipe off...thats it. Quick and easy. Thought I'd pass this on for what its worth.
Haven't tried it yet on outside plastic but suspect it will work well on them too.