I also want to commend your choice of a higher concentration alcohol.
It's best for low-residue on both precision metal parts and electronics.
Well done.
100% (er, 91%, I guess)! I don't see much point in the more diluted mixes.
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100% is treated like a damned controlled substance.
Your molarity is great.
Molarity. Dang, haven't heard that word since Soph Honors Chem!