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For a black engine it is Pig Spit.Makes um look like new! S-100 is more of a cleaner.
Originally Posted by ONEDOWNAND5UP
S-100 has an engine brightner too.
IMO, S100 Engine Brightener and Pig Spit are interchangeable. Either will collect less dust and grime and produce a more natural, matte finish if buffed off while still wet.
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