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I do not like anything stringent like brake clean or laquer thinner to take off build up with an abrasive pad becuase it could scratch. I worry about this more with cyl heads but I like to make sure its the same that when I left it.
Since when is a shop towel abrasive? Virgin lacquer thinner doesn't need an abrasive pad to take off build up, it melts it and you wipe it off.