I also voted (mineral spirits), but my choice doesn't reflect the system I use. Like LarryBible I use mineral spirits for the bulk of the flush action, then follow with brake cleaner or lacquer thinner to remove mineral spirit residue. Whenever I degrease auto parts where I work, I use the same logistics (mineral spirits followed by alcohol) because my parts need to be absolutely clean. Mineral spirits for economical flushing -- brake cleaner for quality flushing.
95 E320 Cabriolet, 131K