I have been using 50/50 Al Cass & Blue Juice since 1993 on rotor faces and have never had a stuck or gummy rotor whether it was a vintage 8D, Eastlake 8D, Alex, Yamaha, or even the Sansone in the attic. This 50/50 mixture was recommended to me by a highly respected repairman/horn maker so I think I'll trust it (no offense to Steve M). Of course I have never used Blue Juice by itself either.
As to the person who left their horn in the trunk for two seasons in PA, I highly doubt that the person's horn was free of growth prior to being forgotten. Really, forgetting about one's horn period indicates a few things by itself. The Jack Attack!
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